Streamline the sync warning dialog

[digitarald]

Testing #145525:

is a lot to read and click on, especially for new users that don't understand how vscode.dev works. Three 1-liner paragraphs and 4 buttons to pick from. A shorter form could be friendlier and more guiding:

Quick idea: "VS Code for Web could not open latest content from {repository}, as your last session had uncommited changes in {package.json | 2 files}. We recommend to sync the {18} new commits to keep your changes."

[joyceerhl]

This dialog can only appear for users who have already viewed and edited a repo, so you wouldn't see this when just getting started.

I dropped the Discard Changes action: #145695 (comment)

Thoughts on this language?:

[digitarald]

I am torn on "auto-syncing". Do we use it anywhere else? First time I read it sounded like any changes are auto-saved to github, like auto-commit. Maybe it works, but it would be good if we use it consistently (maybe also in the SCM info tooltip). In the sentence it now mixes "auto-sync", "uncommited", and "commit behind" behind.

If we go with "auto-syncing", "continue without sync" could also adopt the "auto-sync" language. "Keep auto-syncing paused".

[joyceerhl]

We ended up removing the 'auto syncing' language in this dialog and reduced the number of actions shown to 3, thus closing this item.