Fix to Classify stderr warning messages as warnings instead of errors in annotations

[lmvysakh]

Description:
Code fix to properly address errors and warnings.

• Stderr from the installation script is unconditionally logged via core.error(), causing red annotations even for informational warnings. This adds a check to route known warning prefixes through core.warning() instead. All other stderr and the exec flow remain unchanged.

[Copilot]

Pull request overview

Routes known stderr warning output from the Python installation scripts to GitHub Actions “warning” annotations (yellow) instead of “error” annotations (red), improving signal quality while keeping the exec flow unchanged.

Changes:

• Classify stderr messages starting with WARNING: as core.warning(...) instead of core.error(...).
• Keep all other stderr output logged as errors.
• Update the compiled dist/setup/index.js output to match the source change.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/install-python.ts	Adds warning-prefix detection for stderr output and routes it through core.warning.
dist/setup/index.js	Rebuild output reflecting the same stderr classification logic.

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