Add telemetry for command center chat toggles (#296071)

* Initial plan

* Add telemetry for command center chat toggle interactions

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

* Update telemetry owner to joshspicer

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

* Update src/vs/workbench/contrib/chat/browser/agentSessions/experiments/agentTitleBarStatusWidget.ts

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

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