[APIView] Add failure-path telemetry to AutoReview endpoints

[AlitzelMendez]

Adds Application Insights telemetry to the AutoReview controller endpoints (/upload and /create) to help diagnose failures that are difficult to investigate with current logging.

Background

A user reported receiving HTTP 520 errors when uploading packages to APIView. Investigation revealed that our server returned HTTP 400, but we had insufficient logging to determine the root cause. The request failed before reaching the parser (12ms response time vs ~10s for successful parsing), indicating the failure occurred during request processing rather than code file parsing.

[Copilot]

Pull request overview

Adds Application Insights telemetry to AutoReview failure paths to improve diagnostics for /autoreview/upload and /autoreview/create.

Changes:

• Injects TelemetryClient into AutoReviewController and tracks exceptions with request context properties.
• Emits an event when /upload is hit without a file.
• Tracks a failure event when external language parser processes exit non-zero, including truncated stdout/stderr.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
src/dotnet/APIView/APIViewWeb/LeanControllers/AutoReviewController.cs	Adds AI telemetry to /upload and /create exception paths and a “no file provided” event.
src/dotnet/APIView/APIViewWeb/Languages/LanguageProcessor.cs	Adds AI telemetry for external parser process failures (non-zero exit code).

Comments suppressed due to low confidence (1)

src/dotnet/APIView/APIViewWeb/LeanControllers/AutoReviewController.cs:99

• The fall-through path logs "UploadAutoReview_NoFileProvided" and returns a 500, but this branch is also hit when a file was provided and CreateAutomaticRevisionAsync returns null (or apiRevision stays null for other reasons). Please split the control flow so: (1) missing file returns a 400 BadRequest (and logs a "NoFileProvided" event), and (2) apiRevision == null returns a 500 with an accurate error and telemetry.

        _telemetryClient.TrackEvent("UploadAutoReview_NoFileProvided");
        return StatusCode(statusCode: StatusCodes.Status500InternalServerError, new
        {
            error = "Failed to create API review. No file provided."