Don't escape special chars in autolinks in the rich-text editor

What does this MR do and why?

Don't escape special characters in autolinks in the rich-text editor! Fixes Rich text editor duplicates some backslashes (#507450 - closed).

Regressed in Remove preserve_markdown FF and supporting code (!218383 - merged), precisely at this exact line — the LHS had escape: false, which looked specific to preserveUnchangedMark (which was part of the preserve_markdown FF, then being removed), but was actually keeping escaping from happening too for the regular pathway.

We have a state.inAutolink mechanism for preventing this correctly, so let's use it.

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Go to a Markdown field on your GDK, and in the plain-text editor, enter a URL with a ~ or a \ in it. I'm using https://pokemon.com/~hi as an example.
2. Switch between plain- and rich-text editors. It should remain the same.
3. Switching to the rich-text editor, add a single letter anywhere in the text field. Just change the input somehow.
4. Switch back to the plain-text editor. An extra backlash has appeared.
5. Switch back to the rich-text editor and make another single change.
6. Switch back to the plain-text editor. The backslashes have increased in number.
7. etc.
8. Check out this branch.
9. Repeat, and rejoice, at the lack of backslash proliferation.

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