feat: Harvest should parse labels in CM pb files

[cgrinds]

No description provided.

[Copilot]

Pull request overview

Enables Harvest’s cmperf cmmetrics protobuf parser to read counter schema label fields (X/Y labels) so label metadata in CM .pb files is preserved and testable.

Changes:

• Implement parsing of counter_x_labels (field 6) and counter_y_labels (field 7) in handleCounterSchema.
• Extend unit tests to cover label parsing (both via fixture parsing and a direct schema payload test).
• Update protobuf test fixture (test1.pb) to include a counter schema with labels.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
cmd/collectors/cmperf/cmmetrics/metrics.go	Parses counter schema label fields 6/7 into LabelsX/LabelsY instead of erroring.
cmd/collectors/cmperf/cmmetrics/metrics_test.go	Adds helper to build string fields and adds assertions/tests validating label parsing.
cmd/collectors/cmperf/cmmetrics/testdata/test1.pb	Updates fixture data to include schema labels for validation in tests.

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