Add a new (advanced) profile setting, pathTranslationStyle (#18195)

`pathTranslationStyle` has four options:

- `none`: Do no translation
- `wsl`: Translate `C:\` to `/mnt/c` and `\\wsl$\Foo\bar` to `/bar`
- `cygwin`: Translate `C:\` to `/cygdrive/c`
- `msys2`: Translate `C:\` to `/c`

It is intended as a broadly-supported replacement for us checking the
source every time the user drops a path.

We no longer need to push the source name all the way down to the
control.

I am hesitant to commit to using other folks' product names in our
settings model,
however, these are almost certainly more recognizable than whatever
other weird
names we could come up with.

The Git Bash fragment extension profile could conceivably use
`pathTranslationStyle`
`msys2` to make sure drag/dropped paths look right.

.github/actions/spelling/expect/expect.txt

@@ -341,6 +341,7 @@ CXVIRTUALSCREEN
 CXVSCROLL
 CYFRAME
 CYFULLSCREEN
+cygdrive
 CYHSCROLL
 CYMIN
 CYPADDEDBORDER