Fix multi-project commit detection in GitLab import tool

[Copilot]

The GitLab commit import tool was only detecting commits from one project when users had multiple projects across different groups. This was caused by two bugs in the project processing logic:

Root Cause

1. Commit counter bug: The code incorrectly used the outer loop variable projectID (which always remained 0) instead of the actual project ID when storing commit counts:

   projectID := 0  // Never updated
   for _, project := range projects {
       // Process commits...
       projectCommitCounter[projectID] = commits  // BUG: Always overwrites key 0
   }

2. Pagination inefficiency: The idAfter parameter for cursor-based pagination was never updated, causing redundant GitLab API calls.

Changes Made

• Fixed commit tracking: Changed projectCommitCounter[projectID] to projectCommitCounter[project] to properly track each project's commits
• Improved pagination: Added logic to update idAfter with the highest project ID from each page for efficient cursor-based pagination
• Enhanced code clarity: Renamed confusing projectID variable to idAfter to better reflect its purpose
• Added documentation: Included comment explaining the pagination logic

Before vs After

Before (buggy behavior):

Processing project 123 with 5 commits
Processing project 456 with 3 commits  
Processing project 789 with 8 commits
Final result: project 0: 8 commits (only last project tracked!)

After (fixed behavior):

Processing project 123 with 5 commits
Processing project 456 with 3 commits
Processing project 789 with 8 commits  
Final result:
  project 123: 5 commits
  project 456: 3 commits  
  project 789: 8 commits

Impact

Users with multiple GitLab projects across different groups will now see commits imported from all their projects, not just one. The fix also improves GitLab API efficiency by implementing proper cursor-based pagination.

Fixes #82.

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