…2243)

Follow-up to elastic#181501

This moves the alert details context used by the AI Assistant from the
apm api `GET /internal/apm/assistant/get_obs_alert_details_context` to
the Obs api
`/internal/observability/assistant/alert_details_contextual_insights`.

This also involves adding a type safe API client to the observability
API tests

### Other changes:

- Rename `synthtraceEsClient` to `apmSynthtraceEsClient` to indicate it
is specific to APM

(cherry picked from commit 0c9a323)

…2243) (#182375)

# Backport

This will backport the following commits from `main` to `8.14`:
- [[Obs AI Assistant] Move alert context from apm to obs api
(#182243)](#182243)

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

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

<!--BACKPORT [{"author":{"name":"Søren
Louv-Jansen","email":"soren.louv@elastic.co"},"sourceCommit":{"committedDate":"2024-05-02T14:03:23Z","message":"[Obs
AI Assistant] Move alert context from apm to obs api
(#182243)\n\nFollow-up to
https://github.com/elastic/kibana/pull/181501\r\n\r\nThis moves the
alert details context used by the AI Assistant from the\r\napm api `GET
/internal/apm/assistant/get_obs_alert_details_context` to\r\nthe Obs
api\r\n`/internal/observability/assistant/alert_details_contextual_insights`.\r\n\r\nThis
also involves adding a type safe API client to the observability\r\nAPI
tests\r\n\r\n### Other changes:\r\n\r\n- Rename `synthtraceEsClient` to
`apmSynthtraceEsClient` to indicate it\r\nis specific to
APM","sha":"0c9a323816beedaa32f928312f3cefe8ea66e316","branchLabelMapping":{"^v8.15.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","ci:project-deploy-observability","Team:obs-ux-infra_services","Team:obs-ux-management","v8.14.0","v8.15.0"],"title":"[Obs
AI Assistant] Move alert context from apm to obs
api","number":182243,"url":"https://github.com/elastic/kibana/pull/182243","mergeCommit":{"message":"[Obs
AI Assistant] Move alert context from apm to obs api
(#182243)\n\nFollow-up to
https://github.com/elastic/kibana/pull/181501\r\n\r\nThis moves the
alert details context used by the AI Assistant from the\r\napm api `GET
/internal/apm/assistant/get_obs_alert_details_context` to\r\nthe Obs
api\r\n`/internal/observability/assistant/alert_details_contextual_insights`.\r\n\r\nThis
also involves adding a type safe API client to the observability\r\nAPI
tests\r\n\r\n### Other changes:\r\n\r\n- Rename `synthtraceEsClient` to
`apmSynthtraceEsClient` to indicate it\r\nis specific to
APM","sha":"0c9a323816beedaa32f928312f3cefe8ea66e316"}},"sourceBranch":"main","suggestedTargetBranches":["8.14"],"targetPullRequestStates":[{"branch":"8.14","label":"v8.14.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v8.15.0","branchLabelMappingKey":"^v8.15.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/182243","number":182243,"mergeCommit":{"message":"[Obs
AI Assistant] Move alert context from apm to obs api
(#182243)\n\nFollow-up to
https://github.com/elastic/kibana/pull/181501\r\n\r\nThis moves the
alert details context used by the AI Assistant from the\r\napm api `GET
/internal/apm/assistant/get_obs_alert_details_context` to\r\nthe Obs
api\r\n`/internal/observability/assistant/alert_details_contextual_insights`.\r\n\r\nThis
also involves adding a type safe API client to the observability\r\nAPI
tests\r\n\r\n### Other changes:\r\n\r\n- Rename `synthtraceEsClient` to
`apmSynthtraceEsClient` to indicate it\r\nis specific to
APM","sha":"0c9a323816beedaa32f928312f3cefe8ea66e316"}}]}] BACKPORT-->

Co-authored-by: Søren Louv-Jansen <soren.louv@elastic.co>