Remove cleanPrompt method from CopilotRemoteAgentManager

[Copilot]

This PR removes the cleanPrompt method from the CopilotRemoteAgentManager class as requested. The method was previously used to strip #file:xxxx patterns from user prompts before processing them.

Changes Made

• Removed the cleanPrompt(prompt: string): string method from CopilotRemoteAgentManager
• Updated the provideNewChatSessionItem method to use options.prompt directly instead of calling this.cleanPrompt(options.prompt)

Impact

With this change, prompts will no longer be automatically cleaned of #file:xxxx patterns. The prompts will be processed as-is without any modification. This affects the behavior in the provideNewChatSessionItem method where prompts are prepared for new coding agent sessions.

The changes are minimal and surgical - only 4 lines were removed (the method definition) and 1 line was modified (the direct usage of the prompt).

Verification

• ✅ Code compiles successfully
• ✅ Linting passes
• ✅ Hygiene checks pass
• ✅ No remaining references to cleanPrompt in the codebase

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• update.code.visualstudio.com
  • Triggering command: /opt/hostedtoolcache/node/20.19.4/x64/bin/node ./out/src/test/runTests.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Created from VS Code via the GitHub Pull Request extension.

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