Fix comment syntax in JetBrains gitignore

[huyz]

Comments must have # starting the line. Inline #s would just prevent the ignore lines from working as intended.

Reasons for making this change

Fix a syntax error which makes .idea/sonarlint.xml ineffective

Links to documentation supporting these rule changes

TODO

https://git-scm.com/docs/gitignore

A line starting with # serves as a comment.

Merge and Approval Steps

• Confirm that you've read the contribution guidelines and ensured your PR aligns
• Ensure CI is passing
• Get a review and Approval from one of the maintainers

[Copilot]

Pull Request Overview

This PR fixes a .gitignore syntax issue in the JetBrains global template so that SonarLint files are properly ignored.

• Move the inline “#” comment to its own line to comply with .gitignore rules
• Ensure .idea/sonarlint.xml is correctly ignored

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