Add validate-action-output.yml reusable workflow

[paper2]

Summary

• Add validate-action-output.yml reusable workflow for testing the GitHub Action with OpenTelemetry collector validation

Details

This workflow provides a comprehensive testing framework for validating the GitHub Action's telemetry output:

• OpenTelemetry Collector Setup: Automatically starts and health-checks an OTLP collector
• Telemetry Validation: Collects and validates both traces and metrics data
• Structure Comparison: Compares normalized telemetry structure with expected test data
• Artifact Upload: Saves collector logs for debugging purposes
• Configurable Parameters: Supports custom test data directories and artifact settings

Test Plan

• Workflow file contains proper YAML syntax
• All required inputs are defined with appropriate defaults
• OpenTelemetry collector configuration is properly mounted
• Health checks are implemented for collector readiness
• JQ normalization filters handle dynamic fields correctly
• Structure validation compares against expected test data
• Artifact upload preserves debugging information

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