Refs: #252052

• anyOS @kieferrm
• anyOS @hediet

Complexity: 3

Authors: @aeschli @roblourens

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• run latest insiders with the vscode-copilot-chat installed
• create a few mode files in the chat view menu:
  • click on the settings/gear icon and select 'Mode'
  • select the entry to create a new mode file in either the workspace or in the user data folder
• in the editor. configure the mode with a description, tools and description
• switch to a custom mode with the mode selection widget in the chat view
• test that the chat input placeholder matches the description of the mode (if set)
• test that the model in the mode file and the current model are in sync
• test that the active tools in the mode file matches the tools in the chat, Use the tool picker to see what tools are active.
• test that the tool picker has a description that shows that the tools are from the mode file changes will be applied there
• switch between mode and validate it all works as expected
• run a prompt in a mode and verify it works as expected