* Add template system for tab descriptions. (#12965)

* Add a boolean flag to onConfigurationChanged to prevent updates during initialization.

* - Change configuration key to 'workbench.editor.tabSubtitle'.
- Change configuration type to the enum ['default', 'short', 'medium', 'long']
- Move path logic into FileEditorInput.
- Move configuration handling into GroupService/ITabOptions.
- Refactor duplicate path shortening logic.

* Don't consider empty-string descriptions during de-duplication. Don't show subtitle when all descriptions are identical.

* Minor fixes and documentation.

fixes #33903
fixes #19890

fixes #16322
fixes #23646

quick fix: select first entry in menu automatically for fast access

Use canvas to render the terminal

Fixes #28397

cursorAccent theme color

Fix a small typo in snippet.md

Signed-off-by: NRemy Suen <remy.suen@gmail.com>