Proposed Terminal API onData

* FrontMatter rendered properly on markdownEngine

* FrontMatter terminates for 3 - or .

* Regex applied on both files for markdown

* Send machineId in crash reports

* Update key for machineId to reflect that it was sent from vscode

Part of #23177

Removed redundant call to prevent widget appearing when stack frame does not match the model uri. Fixes #22607

Fixes #23148

Brings in:
- Reducing viewport size does not discard data
- Allow link register before attached to DOM

Fixes #23148

Fixes #23149