[Entity Store] Publish v2 API routes

[kubasobon]

Summary

Towards #248279
Design outline and breaking change proposal: https://github.com/elastic/dev/issues/3455 (accepted)

Checklist

• 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
• Review the backport guidelines and apply applicable backport:* labels.

[CAWilson94]

Just want to double check the internal headers here was meant since everywhere else seems to be going from internal -> public. Is this a logs extraction specific perms elevation needed or something similar?

[kubasobon]

This was very much deliberate. The difference between public and internal is not very heavily gated, but endpoints like FORCE_LOG_EXTRACTION were not meant for "public" use - either by other plugins or the end users.

[CAWilson94]

LGTM 🚀 asked one non blocking question 🙏

[kubasobon]

Warning

Do not merge before #259732

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: d3bbb0a
• Storybooks Preview

Failed CI Steps

• Jest Tests #5
• Jest Integration Tests #10
• FTR Configs #36
• FTR Configs #52

Test Failures

• [job] [logs] Jest Tests #5 / should call onSelectionChange on user selection
• [job] [logs] FTR Configs #52 / Entity Analytics - Risk Score Maintainer @ess @serverless @serverlessQA Risk Score Maintainer Resolution Scoring with test log data aggregates a multi-alias group into a single resolution score
• [job] [logs] FTR Configs #36 / ESQL execution logic API @ess @serverless ES|QL rule type esql query specific syntax mv_expand command pagination should not create more than max_signals alerts from single document when paginate through results
• [job] [logs] Jest Integration Tests #10 / workflow with wait step when duration is short should have correct workflow duration

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
securitySolution	11.6MB	11.6MB	+94.0B

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
entityStore	8.4KB	8.5KB	+124.0B

History

• 💚 Build #421679 succeeded 5bfab6e
• 💔 Build #421208 failed 6cc54e3
• 💔 Build #421123 failed 776fe52
• 💔 Build #419657 failed e2fb76f
• 💔 Build #419553 failed 662309f

cc @kubasobon