…hould disable ESQL Tab. (elastic#182816)

## Summary

handles elastic#182798

Recently there was PR : elastic#181616
which does not disable ES|QL tab in timeline even if feature flag is
disabled when :
- User has already created a ESQL Query in timeline and saved the
timeline.

This PR makes sure when below feature flag exists, then `ES|QL` tab will
be definitely disabled even when user has a saved timeline with ES|QL
Query in it.

```yaml
xpack.securitySolution.enableExperimental:
  - timelineEsqlTabDisabled

```

## Desk Testing Guidelines

1. Remove above Feature Flag
2. Go to Timeline and Create a Timeline with ESQL Query
3. Save the timeline.
4. Go To advanced Settings and search for `esql` and disable the
`enableESQL` setting.
5. Go back to the timeline saved in step 3.
6. ✅ Assert that the `ES|QL` tab is still there.
7. ✅ Assert that the `ES|QL` tab is NOT there in a new timeline.
8. Add above feature flag - which disables the esql Tab.
9. Go back to the timeline saved in step 3.
10. ✅ Assert that the `ES|QL` tab is no longer there.
11. ✅ Assert that the `ES|QL` tab is NOT there in a new timeline.

### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

(cherry picked from commit c43da3e)

… flag should disable ESQL Tab. (#182816) (#182905)

# Backport

This will backport the following commits from `main` to `8.14`:
- [[Security Solution] Timeline : Disabling Timeline ESQL feature flag
should disable ESQL Tab.
(#182816)](#182816)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Jatin
Kathuria","email":"jatin.kathuria@elastic.co"},"sourceCommit":{"committedDate":"2024-05-08T06:21:30Z","message":"[Security
Solution] Timeline : Disabling Timeline ESQL feature flag should disable
ESQL Tab. (#182816)\n\n## Summary\r\n\r\nhandles
https://github.com/elastic/kibana/issues/182798\r\n\r\nRecently there
was PR : https://github.com/elastic/kibana/pull/181616\r\nwhich does not
disable ES|QL tab in timeline even if feature flag is\r\ndisabled when
:\r\n- User has already created a ESQL Query in timeline and saved
the\r\ntimeline.\r\n\r\nThis PR makes sure when below feature flag
exists, then `ES|QL` tab will\r\nbe definitely disabled even when user
has a saved timeline with ES|QL\r\nQuery in
it.\r\n\r\n```yaml\r\nxpack.securitySolution.enableExperimental:\r\n -
timelineEsqlTabDisabled\r\n\r\n```\r\n\r\n## Desk Testing
Guidelines\r\n\r\n1. Remove above Feature Flag\r\n2. Go to Timeline and
Create a Timeline with ESQL Query\r\n3. Save the timeline.\r\n4. Go To
advanced Settings and search for `esql` and disable the\r\n`enableESQL`
setting.\r\n5. Go back to the timeline saved in step 3. \r\n6. ✅ Assert
that the `ES|QL` tab is still there.\r\n7. ✅ Assert that the `ES|QL` tab
is NOT there in a new timeline.\r\n8. Add above feature flag - which
disables the esql Tab.\r\n9. Go back to the timeline saved in step
3.\r\n10. ✅ Assert that the `ES|QL` tab is no longer there.\r\n11. ✅
Assert that the `ES|QL` tab is NOT there in a new
timeline.\r\n\r\n\r\n### Checklist\r\n\r\n- [x] [Unit or
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Solution] Timeline : Disabling Timeline ESQL feature flag should disable
ESQL Tab. (#182816)\n\n## Summary\r\n\r\nhandles
https://github.com/elastic/kibana/issues/182798\r\n\r\nRecently there
was PR : https://github.com/elastic/kibana/pull/181616\r\nwhich does not
disable ES|QL tab in timeline even if feature flag is\r\ndisabled when
:\r\n- User has already created a ESQL Query in timeline and saved
the\r\ntimeline.\r\n\r\nThis PR makes sure when below feature flag
exists, then `ES|QL` tab will\r\nbe definitely disabled even when user
has a saved timeline with ES|QL\r\nQuery in
it.\r\n\r\n```yaml\r\nxpack.securitySolution.enableExperimental:\r\n -
timelineEsqlTabDisabled\r\n\r\n```\r\n\r\n## Desk Testing
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Create a Timeline with ESQL Query\r\n3. Save the timeline.\r\n4. Go To
advanced Settings and search for `esql` and disable the\r\n`enableESQL`
setting.\r\n5. Go back to the timeline saved in step 3. \r\n6. ✅ Assert
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Assert that the `ES|QL` tab is NOT there in a new
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Solution] Timeline : Disabling Timeline ESQL feature flag should disable
ESQL Tab. (#182816)\n\n## Summary\r\n\r\nhandles
https://github.com/elastic/kibana/issues/182798\r\n\r\nRecently there
was PR : https://github.com/elastic/kibana/pull/181616\r\nwhich does not
disable ES|QL tab in timeline even if feature flag is\r\ndisabled when
:\r\n- User has already created a ESQL Query in timeline and saved
the\r\ntimeline.\r\n\r\nThis PR makes sure when below feature flag
exists, then `ES|QL` tab will\r\nbe definitely disabled even when user
has a saved timeline with ES|QL\r\nQuery in
it.\r\n\r\n```yaml\r\nxpack.securitySolution.enableExperimental:\r\n -
timelineEsqlTabDisabled\r\n\r\n```\r\n\r\n## Desk Testing
Guidelines\r\n\r\n1. Remove above Feature Flag\r\n2. Go to Timeline and
Create a Timeline with ESQL Query\r\n3. Save the timeline.\r\n4. Go To
advanced Settings and search for `esql` and disable the\r\n`enableESQL`
setting.\r\n5. Go back to the timeline saved in step 3. \r\n6. ✅ Assert
that the `ES|QL` tab is still there.\r\n7. ✅ Assert that the `ES|QL` tab
is NOT there in a new timeline.\r\n8. Add above feature flag - which
disables the esql Tab.\r\n9. Go back to the timeline saved in step
3.\r\n10. ✅ Assert that the `ES|QL` tab is no longer there.\r\n11. ✅
Assert that the `ES|QL` tab is NOT there in a new
timeline.\r\n\r\n\r\n### Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common
scenarios","sha":"c43da3e4349a6bb13cdab507530efd926147c30b"}}]}]
BACKPORT-->

Co-authored-by: Jatin Kathuria <jatin.kathuria@elastic.co>