Hide "Refresh Chat Sessions" command when experimental.chat disabled

[Copilot]

The "Refresh Chat Sessions" command appears in the command palette even when githubPullRequests.experimental.chat is false. This occurs because VS Code auto-generates the command when an extension enables the chatSessionsProvider API proposal.

Changes

• Added commandPalette contribution with when clause to hide the auto-generated refresh command:

  {
    "command": "workbench.action.chat.refreshChatSessions",
    "when": "config.githubPullRequests.experimental.chat"
  }

Notes

The command ID workbench.action.chat.refreshChatSessions follows standard VS Code patterns for chat-related commands. If VS Code uses a different ID, alternatives to try: chat.refreshChatSessions, GitHub.vscode-pull-request-github.refreshChatSessions.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>GitHub Pull Requests: Refresh Chat Sessions command remains available with disableAIFeature set to true</issue_title>
<issue_description>

1. Set disableAIFeature setting to true.
2. Open command palette
3. Search for "Chat"

Expected result: You should only see one command (to enable AI)
Actual result: GitHub Pull Requests: Refresh Chat Sessions command is still available as well.
</issue_description>

<agent_instructions>All AI/Copilot features should be disabled when the disableAIFeatures setting is set to true. This includes the Copilot PR query and all sparkle actions.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes GitHub Pull Requests: Refresh Chat Sessions command remains available with disableAIFeature set to true #8376

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