Revert "Use editor base weight when contributing peek commands, fixes https://github.com/microsoft/vscode/issues/109727#issuecomment-720986472"

This reverts commit 7601718c.

#83188

* Including '`' as part of foldEndPairCharacters

* Removed test code, which was unrelated

Made while testing #106410

For #109702

Iframe based webviews need to redispatch keypresses so that VS Code commands are supported. However, if this command is also in the native menu bars, this can end up triggering the command twice (once from the menubar and once from the webview's dispatch)

We already fixed this for `<webview>` based webview. This change also fixes the issue for iframe based webviews

For #109967

Fix #88703

Add color token for error background

Fixes https://github.com/microsoft/vscode/issues/110109

refs #109967

fixes #108712

Fixes terminal lags while scrollling when printing long line

fixes #94101

Co-authored-by: Nrebornix <penn.lv@gmail.com>