fix: cap GitLab contribution pagination (#1247)

[mittalsonal]

Description\n- add a GitLab pagination safety cap in etchGitLabContributions()\n- stop malformed or repeated x-next-page values from keeping the request alive indefinitely\n- align the GitLab fetch guard with the existing bounded GitHub pagination pattern in the same route\n\n## Related Issue\n- Closes #1247\n\n## Checklist\n- [x] one-file fix\n- [x] git diff --check passes\n- [x] change is scoped to the GitLab contributions pagination loop only\n\n## Pillar\n- Open Source\n

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[mittalsonal]

Kind request for GSSoC labels when reviewed: gssoc:approved, one level:* label, and ype:bug if it fits the repo’s scoring rubric. Thanks!

[mittalsonal]

Verification completed locally:

• git diff --check

This PR intentionally keeps the change small and limited to the GitLab contributions pagination guard in src/app/api/metrics/contributions/route.ts.

[github-actions]

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