gradlew/gradlew.bat should not be gitignored according to official doc

[fzyzcjy]

Close #109749

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I signed the CLA.
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is test-exempt.
• All existing and new tests are passing.

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[jonahwilliams]

This is the repo's gitignore, not a template file gitignore.

[fzyzcjy]

I know. The problem is, maybe flutter repo itself also need to follow gradle's official suggestion?

[jonahwilliams]

We've done this historically because the tool can handle re-generating this and to avoid churn in the repo when the contents of this file changes.

[jonahwilliams]

I'm going to close this PR, as we don't intend to accept this change. If something changes we can always reconsider

[fzyzcjy]

I see. Thanks all the same