simple terminal tools on surface level of chat (#296870)

* simple terminal tools on surface level of chat

* Set SimpleTerminalCollapsible default true for Insiders, false for Stable (#296911)

* Initial plan

* Set SimpleTerminalCollapsible default true for insiders, false for stable

Co-authored-by: justschen <[email protected]>

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Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: justschen <[email protected]>

* make sure it is initialized the right way

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Co-authored-by: Copilot <[email protected]>