[WIP] Fix Go Logger Enhancement workflow failure

[Copilot]

• Add debug logging to internal/tracing/fanout.go using the existing logTracing package-level logger
• Validate changes with make agent-finished

[Copilot]

Pull request overview

This PR adds additional debug logging around the tracing OTLP fanout span exporter to help diagnose/export/shutdown behavior and backend failures.

Changes:

• Log when newFanoutExporter bypasses fanout (single exporter) vs creates a fanout exporter.
• Log fanout export start, per-backend export errors, and a failure summary.
• Log fanout shutdown start, per-backend shutdown errors, and completion status.

Show a summary per file

File	Description
internal/tracing/fanout.go	Adds debug logging around fanout exporter creation, span export, and shutdown flows.

Copilot's findings

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• Files reviewed: 1/1 changed files
• Comments generated: 2

[lpcox]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Resolved in commit 61c8af0. The conflict arose because main refactored the concurrent dispatch logic into a new forEachExporter helper method. I adapted the debug logging to that new structure by adding an op string parameter to forEachExporter, which threads the operation name ("ExportSpans" / "Shutdown") into per-backend error log messages — addressing the reviewer's request to identify which exporter failed.