feat: expand GitLab evalContext with the HEAD pipeline for the MR

[jippi]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 2.34%. Comparing base (0b04c12) to head (e60d9f3).

Files with missing lines	Patch %	Lines
pkg/scm/gitlab/context_valuers.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #97      +/-   ##
========================================
- Coverage   2.34%   2.34%   -0.01%     
========================================
  Files         51      51              
  Lines       2431    2433       +2     
========================================
  Hits          57      57              
- Misses      2366    2368       +2     
  Partials       8       8              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.