[Metrics] - Add observability tracking for $search extension

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    • Type: Task
    • Resolution: Unresolved
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: None
    • Query Integration
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      As $search moves to the Extensions API, we need observability to measure extension uptake, diagnose fallback behavior, and make rollout decisions. Existing extension boundary metrics (extensionSuccesses, extensionFailures, hostSuccesses, hostFailures) show API health but are not $search-scoped, so they are insufficient alone for rollout decisions.

        1.
        		 Register $search extension metrics SERVER-122714 Sub-task In Code Review Daniel Segel  
        2.
        		 Increment counters upon extension and legacy $search execution SERVER-122716 Sub-task In Code Review Josh Siegel  

            Assignee:
            Josh Siegel
            Reporter:
            Josh Siegel
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              Created:
              Updated: