fixes #28219

Having ` as an autoclosing pair makes typing fenced code blocks annoying

https://github.com/Microsoft/vscode/pull/28172#issuecomment-306944985

This reverts commit 0425eff0.

Fixes #27980

Fixes #28210

Only show the markdown preview commands when you are in a markdown file

* 🔧 renew Markdown lang config

* 🎨 format

Fixes #28206

Fixes #28095

Removes the manual error logging on client requests in favor of doing this automatically in the service client. Also fixes logging of canellation errors

Minor refactor. Does not change any logic.