chore: Update pr.yaml to show actual condition so easier to follow

[monilpat]

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Relates to:

No specific issue linked. Improving PR error messaging.

Risks

Low: This change only affects error messages shown during PR validation.

Background

What does this PR do?

This PR updates the pr.yaml configuration file to include explicit error messages for pull request validation. The messages provide clear guidance on expected fields and values.

What kind of change is this?

• Improvement (miscellaneous changes to existing features).

Why are we doing this? Any context or related work?

To enhance the contributor experience by providing clearer error messages, reducing confusion, and speeding up corrections.

Documentation changes needed?

My changes do not require a change to the project documentation.

Testing

Where should a reviewer start?

Review the updated pr.yaml file. Focus on the checks section where the error messages have been updated.

Detailed testing steps

1. Create a pull request with missing or incorrect fields.
2. Confirm that the error messages specify the required corrections.
3. Verify that all expected options (e.g., PR types) are listed clearly in the error message.

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