Fixes #8962

Fixes #55904
Fixes #55903

Update xterm

Disable add comment button when textbox is empty, fixes https://github.com/Microsoft/vscode-pull-request-github/issues/128

Part of #44302

The default and only option is now dynamic

Fixes #54907

Removed Terminal.send (private API).

* Fix bug causing workspace recommendations to go away upon ignoring a recommendation

* ONly show on @recommended or @recommended:workspace

* Make more consistant

Tests about to check the improvements: ${}, $$, and $(shell ()).