Prototype agent sessions window (#289707)

* prototype agent sessions window

* prototype agent sessions window

* polish defaults

* apply template changes on startup

* move under resources

* some fixes and disable profile actions in agent sessions window

* disabe manage profile actions for agent sessions workspace

* fix fixing window title

* disable when chat is hidden

* simplify

* feedback

* fix tests

* disable the action in stable

* Update resources/profiles/agent-sessions.code-profile

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

* Update src/vs/platform/userDataProfile/common/userDataProfileTemplateWatcher.ts

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

* Update src/vs/platform/userDataProfile/common/userDataProfile.ts

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

---------

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