Add ability to update and track operator auto-instrumentation images

[jvoravong]

Description

• Introduced the ability to automatically track both native OpenTelemetry and Splunk instrumentation libraries within this Helm chart project.
  • Rationale: Due to the limitations of fetching native OpenTelemetry instrumentation library information, we've implemented CI/CD workflows to automate this process. This ensures that every time the operator subchart is updated, the corresponding instrumentation library information in the values.yaml file is also updated.
  • A running operator doesn't disclose the version information of the instrumentation libraries until deployed. Helm release values cannot be dynamically updated after an install/upgrade to include this information, necessitating this enhancement.
  • No new instrumentation libraries were added. This update merely makes explicit what was previously implicit, enabling easier tracking and management (example).
  • With the instrumentation libraries being explicitly defined, we can now track them in version control and use the otel resource attribute splunk.zc.method to track usage.
• Began refactoring the GitHub workflow to make the code reusable both in GitHub Actions and locally. Added a --debug parameter for debugging purposes.

Testing

• Validated by deploying the operator with the latest changes. Ensured that the OTEL_RESOURCE_ATTRIBUTES and OTEL_EXPORTER_OTLP_ENDPOINT values were correctly managed.

Documentation

• Increased inline code documentation and comments for better maintainability.
• Updated NOTES.txt to provide users with clearer information regarding the status and capabilities of auto-instrumentation components.

[hughesjj]

I hate how much shell is needed but it's some of the most readable shell I've ever seen

[jvoravong]

I hate how much shell is needed but it's some of the most readable shell I've ever seen

Agreed. My longterm vision is to centralize the non-trivial shell code as much as possible so it can easily be executed from the Makefile.