Make CI run agent tests too for now

[artem-shelkovnikov]

Closes https://github.com/elastic/search-team/issues/8207

With this change CI will run tests for the agent component along with regular tests. That'll help us find issues with protobuf bumps and general problems with components and prevent merging broken changes to main.

Checklists

Pre-Review Checklist

• [x] this PR does NOT contain credentials of any kind, such as API keys or username/passwords (double check config.yml.example)
• [x] this PR has a meaningful title
• [x] this PR links to all relevant github issues that it fixes or partially addresses
• [x] if there is no GH issue, please create it. Each PR should have a link to an issue
• [x] this PR has a thorough description
• [x] Covered the changes with automated tests
• [x] Tested the changes locally
• [x] Added a label for each target release version (example: v7.13.2, v7.14.0, v8.0.0)

[github-actions[bot]]

💚 Backport PR(s) successfully created

Status	Branch	Result
✅	8.x	https://github.com/elastic/connectors/pull/2823

This backport PR will be merged automatically after passing CI.