chore: use provider wide funcs

[zakisk]

this does little change of using IsZeroSHA func from provider package instead of having own func is gitlab ParsePaylaod.

📝 Description of the Change

🔗 Linked GitHub Issue

Fixes #

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[chmouel]

/lgtm

[pipelines-as-code]

Congrats @zakisk your PR Has been approved 🎉

✅ Pull Request Approved

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• Required Approvals: 1
• Current Approvals: 1

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Reviewer	Permission Level	Approval Status
@chmouel	admin	✅

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[gemini-code-assist]

Code Review

This pull request refactors the GitLab payload parsing logic by replacing the local isZeroSHA helper function with a shared implementation from the provider package. I have no feedback to provide as there are no review comments to evaluate.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 58.81%. Comparing base (4c43e22) to head (5593792).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/provider/gitlab/parse_payload.go	0.00%	0 Missing and 1 partial ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2672      +/-   ##
==========================================
- Coverage   58.81%   58.81%   -0.01%     
==========================================
  Files         206      206              
  Lines       20308    20306       -2     
==========================================
- Hits        11944    11942       -2     
  Misses       7591     7591              
  Partials      773      773              

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