fix(amazonq): Truncating user prompt for unit test generation.

[laileni-aws]

Types of changes

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

Description

Problem

• If user gives user input prompt more than 4096 characters, this fails at RTS as model supports only 4096 input characters.
  Value at 'userInput' failed to satisfy constraint: Member must have length less than or equal to 4096
• Ideally we should not get more than 4096 char input from user input but still features like /test, /dev were able to get the message length more than 4096.

This recording is for VSCode but similar experience for JB too.

Trim.User.prompt.issue.mov

Solution

• To resolve this issue, we are adding a truncation logic to continue the test generation workflow instead of failing at RTS.
• No new tests were added as the functionality is not impacted.

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.