Add comprehensive metrics for repository rename operations

Problem

Currently, we lack comprehensive visibility into repository rename operations. While individual metrics exist for the base repository rename query and the sub-repository update query, neither captures the actual count of repositories being updated at the handler level.

Current State

• Individual metrics track the base repository rename query
• Individual metrics track the sub-repository update query
• No comprehensive metric encompasses the entire rename operation
• No visibility into the total number of targeted repositories per operation

Proposed Solution

Add comprehensive metrics and/or log entries at the handler level that:

1. Track the duration of the entire rename operation
2. Track the frequency of rename requests
3. Include the total count of repositories being updated

Why This Matters

These metrics are essential for:

• Understanding performance characteristics of rename operations
• Making informed decisions about limit increases
• Identifying bottlenecks in rename operations
• Monitoring production behavior
• Assessing whether it's safe to increase the current repository count limit for move operations

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This issue was generated by GitLab Duo