Test: Copilot CLI Forking sessions

[DonJayamanne]

Refs: #302655

• anyOS @pwang347
• anyOS @joaomoreno
• anyOS @rzhao271

Complexity: 3

Authors: @DonJayamanne

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Familiarity with forking of sessions and Copilot CLI
Please read https://code.visualstudio.com/docs/copilot/chat/chat-sessions#_fork-a-chat-session to familiarize your self with this existing feature (this works today in Local chat sessions).

Simple Testing steps

• Start a Copilot CLI chat session , send a few prompts (such as asking model to plan something, then implementing a plan, then malkre more changes)
• Now after you have at least 3 turns, use the fork icon to fork the session (see documentation or below screenshot for icon with red border)
• Verify the title is forked: <original title>, and send a prompt (this is now a new prompt)
• Verify the session only contains request+response until the forked point
• Verify you can find the previous session as well (& this shoudl be un altered)
• Go back to the original session and type /fork in the inbox box and hit enter
• Verify a new session is created with the title forked: <original title>

[joaomoreno]

@DonJayamanne This is an extremely poor TPI:

• There's near zero context in the TPI details
• The linked issue has zero context: Copilot CLI: Forking sessions #302655

Please use our Good Practices guide next time. I will do my best to infer what's been done in this feature.

[joaomoreno]

I don't know what the fork icon looks like:

[DonJayamanne]

@joaomoreno I honestly thought it was a well known feature, apologies for that.
Updated the TPI with links to forking of sessions https://code.visualstudio.com/docs/copilot/chat/chat-sessions#_fork-a-chat-session

I didn't want to add more steps for testing this as this is an existing feature in VS Code, but adopted for Copilot CLI.