Fix: Improve PR number validation and warning messages in input handling

[chiranjib-swain]

Description:
This pull request enhances the validation and handling of the pr-number input for pull requests, ensuring that only valid, positive integers are processed and that invalid or malformed inputs are clearly reported with sanitized warnings. It also adds comprehensive test coverage for these scenarios.

Test coverage improvements:

• Added multiple test cases to main.test.ts to verify that the action warns and skips API calls for various invalid pr-number inputs, including non-numeric strings, negative numbers, zero, numbers with spaces or non-numeric characters, and strings with non-printable or ANSI escape characters. The tests also confirm that valid numbers with whitespace are handled correctly and that a mix of valid and invalid inputs processes only the valid ones.

Input validation and sanitization enhancements:

• Introduced a sanitizeForWarning function in get-pr-numbers.ts to escape non-printable characters in warning messages, making them more readable and secure.
• Improved the getPrNumbers function to:
  • Trim whitespace from each input.
  • Accept only positive integers that match the trimmed input exactly.
  • Provide clear warnings for invalid inputs, using the new sanitization function and including a hint when non-printable characters are detected.

Related issue:
#937

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

This PR fixes validation for the pr-number input so invalid values (non-numeric, zero, negative) are rejected before reaching the GitHub API, and it improves the warning message to echo what the user actually typed.

Changes:

• Fixes the validation condition in get-pr-numbers.ts from && to || so NaN, 0, and negative values are all rejected.
• Updates the warning message to reference the raw input line rather than the parsed result.
• Adds test coverage for invalid and mixed-validity pr-number inputs and updates the built dist/index.js accordingly.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
src/get-inputs/get-pr-numbers.ts	Corrects PR number validation logic and improves warning clarity.
dist/index.js	Updates the compiled distribution output to match the source fix.
tests/main.test.ts	Adds tests ensuring invalid pr-number inputs warn and avoid API calls, and mixed inputs still process valid PRs.

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[chaoscommencer]

I'm not familiar with the configuration requirements for the unit tests, but the character validation looks good!