[Security Solution] Increasing parallelism for Serverless Security specific executions

[MadameSheema]

Summary

Looks like we increased the parallelism number for Serverless Security specific executions on the base.yml but we forgot to do it in the on_merge.yml.

In this PR we are aligning those numbers to avoid failures.

[elasticmachine]

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

[elasticmachine]

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

[jbudz]

@MadameSheema if you get a moment there's also

kibana/.buildkite/pipelines/es_serverless/verify_es_serverless_image.yml

Line 66 in 94f4786

parallelism: 2

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 226b7a9

Failed CI Steps

• x-pack/test_serverless/functional/test_suites/observability/common_configs/config.group2.ts
• FTR Configs #44
• FTR Configs #45
• FTR Configs #47
• Serverless Osquery Cypress Tests #5

Test Failures

• [job] [logs] FTR Configs #44 / cloud_security_posture Cloud Posture Dashboard Page Kubernetes Dashboard displays accurate summary compliance score
• [job] [logs] x-pack/test_serverless/functional/test_suites/observability/common_configs/config.group2.ts / lens serverless - group 1 "after all" hook in "lens serverless - group 1"
• [job] [logs] FTR Configs #45 / Serverless Common UI - Management Data View Management "before all" hook in "Data View Management"
• [job] [logs] FTR Configs #47 / Serverless Common UI - Platform Security Avatar menu "after all" hook for "displays User Menu when clicked"

Metrics [docs]

✅ unchanged

History

• 💚 Build #168056 succeeded 94f4786

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

cc @MadameSheema