…lastic#226545)

## Summary

This PR adds dedicated ad-hoc data view and scope for explore pages.

## Testing
Flip the flag, then navigate to Explore section of the security plugin.

```
xpack.securitySolution.enableExperimental: ['newDataViewPickerEnabled']
```

You should see "Explore Data View" in the new picker on top of the page.
Using `inspector` widget on every visualisation / table should show the
updated index pattern that does not hit the alerts. You can try going
back and forth between the default security data view and the explore
one and compare the pattern rendered in the inspector to confirm that.

### Checklist

Check the PR satisfies following conditions.

Reviewers should verify this PR satisfies this list as well.

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)
- [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 9a45666)

# Conflicts:
#	x-pack/solutions/security/plugins/security_solution/public/explore/hosts/pages/details/index.tsx
#	x-pack/solutions/security/plugins/security_solution/public/explore/network/pages/network.tsx