fix(amazonq): /doc fix prompt to change folder in chat

[vikshe]

fix(amazonq): /doc agent - fix chat messages and buttons for folder selection

1. append "Chose a folder to continue" in the chat when user selects folder
2. when user cancels folder selection dialog display error message and 2 buttons: 'Change folder', 'Cancel'

Types of changes

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

Checklist

• [ X ] My code follows the code style of this project
• I have added tests to cover my changes
• [ X ] 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.

[avi-alpert]

Suggested change

	"description" : "Amazon Q /doc: fix for user prompt to change folder in chat"
	"description" : "Amazon Q /doc: Prompt user to choose a folder if no folder was selected"