Add button to resource viewer to open unsupported resource in external program

Proposed Terminal API onData

**Bug**
Can't view cat gifs in VSCode resource viewer. We only display images that are < 1mb :(

**Fix**
Add a more specific error message for large images and adds button to try opening the file in an external program

* 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