[Telemetry] Move indices metadata out of security solution

[szaffarano]

Summary

This POC makes the indices metadata telemetry feature available on observability clusters.

The goal is to test how it works by porting the logic outside the security solutions plugin. I'm unsure whether the target plugin, metrics_data_access, is ok or we should move the code to another plugin or create a new one.

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, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• This was checked for breaking HTTP API changes, and any breaking changes have been approved by the breaking-change committee. The release_note:breaking label should be applied in these situations.
• Flaky Test Runner was used on any tests changed
• The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines

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Just comment with:

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[szaffarano]

/oblt-deploy

[szaffarano]

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[szaffarano]

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[szaffarano]

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[elasticmachine]

💔 Build Failed

• Buildkite Build
• Commit: 9c8a4ee
• Kibana Serverless Image: docker.elastic.co/kibana-ci/kibana-serverless:pr-212875-9c8a4eed5277

Failed CI Steps

• x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group1/config.ts
• x-pack/test/api_integration/deployment_agnostic/configs/serverless/oblt.serverless.config.ts
• FTR Configs #27
• FTR Configs #27
• FTR Configs #117
• FTR Configs #117

Metrics [docs]

✅ unchanged

History

• 💔 Build #280642 failed 63cec37
• 💔 Build #280423 failed 1b924b1
• 💔 Build #280329 failed e5f3ee8

cc @szaffarano