fix(amazonq): remove parentDispoable for realTimeListener add

[andrewyuq]

1. listener will be completed managed by fileOpen/fileClose, otherwise killing Amazon Q Context process will dispose TextDocumentServiceHandler which will remove this listener before fileClose and logs an error during fileClose

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Description

Checklist

• My code follows the code style of this project
• I have added tests to cover my changes
• A short description of the change has been added to the CHANGELOG if the change is customer-facing in the IDE.
• I have added metrics for my changes (if required)

License

I confirm that my contribution is made under the terms of the Apache 2.0 license.

[Copilot]

Pull Request Overview

This PR updates how the real-time edit listener is registered on documents, removing the automatic disposal via this and relying solely on explicit file open/close management.

• Removed the parentDisposable parameter from addDocumentListener(listener, this)
• Moved file.putUserData(KEY_REAL_TIME_EDIT_LISTENER, listener) to execute after listener registration inside the read action

Comments suppressed due to low confidence (1)

plugins/amazonq/shared/jetbrains-community/src/software/aws/toolkits/jetbrains/services/amazonq/lsp/textdocument/TextDocumentServiceHandler.kt:75

• Without a parentDisposable, this listener will persist indefinitely. Ensure you explicitly remove or clear the listener during fileClose to avoid memory leaks, and consider adding tests to verify that cleanup.

FileDocumentManager.getInstance().getDocument(file)?.addDocumentListener(listener)