Deprecated ReturnTypeWillChangeRector should be reinstated as a downgrade rule

[TobiasBg]

Bug Report

Subject	Details
Rector version	2.2.8

The deprecation of ReturnTypeWillChangeRector no longer leaves a way to add #[\ReturnTypeWillChange] in downgraded code.

See rectorphp/rector-src#7570 (comment) for details and an example.

Expected Behaviour

The ReturnTypeWillChangeRector functionality should be reinstated as a downgrade rule.

[github-actions]

This issue has been automatically marked as stale due to inactivity. It will be closed in next 30 days if no further activity occurs.

[TobiasBg]

It would be great to have this fixed to prevent tedious manual replacements.

[TomasVotruba]

We are now overwhelmed with other issues with higher priority, so this will be likely skipped.
PR is welcomed 🙏

[TomasVotruba]

Best to target the downgrade rules directly.

[TobiasBg]

No worries, I totally understand. I was just hoping that this won't get auto-closed due to the stale label.

[TomasVotruba]

It will, as we have policy to avoid stale issues.

[github-actions]

This issue has been automatically marked as stale due to inactivity. It will be closed in next 30 days if no further activity occurs.