[Fleet] enabling flaky tests with endpoint

[juliaElastic]

Summary

Closes #163203
Closes #167188
Closes #156941

Enable flaky tests, using endpoint-8.6.1 as a fixture bundled package.
See discussion: #167188 (comment)

Closes #170690
The es error was reproducible with an API request to index a document. I had a look at the data stream mappings, and experimented with providing values for the other keyword time_series_dimension fields. It seems the issue is fixed by providing value for one more field.

[juliaElastic]

buildkite, test this

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• /oblt-deploy-serverless : Deploy a serverless Kibana instance using the Observability test environments.
• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[juliaElastic]

buildkite, test this

[juliaElastic]

buildkite, test this

[juliaElastic]

buildkite, test this

[juliaElastic]

buildkite, test this

[juliaElastic]

buildkite, test this

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[nchaulet]

LGTM

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 6c713ad

Metrics [docs]

✅ unchanged

History

• 💚 Build #187433 succeeded 0026a59
• 💛 Build #187015 was flaky 6e8f2c0
• 💔 Build #186984 failed 6f011ea
• 💔 Build #186977 failed 7c10498

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @juliaElastic