[Security Solution] Update CODEOWNERS for the Security Engineering Productivity team

[banderror]

Summary

This PR makes the @elastic/security-engineering-productivity team the owner of the x-pack/test/security_solution_cypress/package.json file to prevent accidentally merging temporary changes to this file like in #169182.

Also, it simplifies the ownership rules a bit. The following lines assign the team to all files under the two specified folders, but not files inside their subfolders, so you don't have to specify individual files:

/x-pack/test/security_solution_cypress/* @elastic/security-engineering-productivity
/x-pack/test/security_solution_cypress/cypress/* @elastic/security-engineering-productivity

[elasticmachine]

Pinging @elastic/security-detections-response (Team:Detections and Resp)

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)

[MadameSheema]

Lots of thanks for taking the time on this!! :)

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 63eacab

Failed CI Steps

• FTR Configs #64

Test Failures

• [job] [logs] FTR Configs #64 / Agents fleet_upgrade_agent "before each" hook for "should respond 400 if trying to upgrade an agent that is unenrolling"

Metrics [docs]

✅ unchanged

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

cc @banderror