telemetry(amazonq): Add changed IDE diagnostics after user acceptance

[leigaol]

Types of changes

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

Description

When user accepts suggestion from inline completion or chat, there can be a change in the current open editor's IDE diagnostics, this can be used as a measure for code suggestion quality. Ref aws/aws-toolkit-vscode#7130.

This change is part of the server side workspace context.

To reduce the risk of large blast radius, this change is only applied for users who are in the experiment of server side project context (both treatment and control), which is the Amzn idc users.

Verified backend request id 6faef702-938e-42eb-894a-957d9757186e

Can be merged post agentic chat

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.