RUM-5555 Add job to build benchmarks runner

[maxep]

What and why?

Add job to build the BenchmarkTests project if any changes were applied to catch build failures in PRs.

How?

Benchmark Build:
  stage: smoke-test
  rules:
    - if: '$CI_COMMIT_BRANCH' # when on branch with following changes compared to develop
      changes:
        paths:
          - "BenchmarkTests/**/*"
        compare_to: 'develop'
  script:
    - make benchmark-build

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)
• Make sure each commit and the PR mention the Issue number or JIRA reference
• Add CHANGELOG entry for user facing changes

[ncreated]

Makes sense 👍. I left 2 feedbacks to consider.