TerminalControl: Support MinGW path translation style (C:\ -> C:/) (#18759)

## Summary of the Pull Request

Support drag-n-drop path translation in the style used by MinGW
programs. In particular for usage with shells like `ash` from busybox
(https://frippery.org/busybox/).

## Detailed Description of the Pull Request / Additional comments

Provides a new option "mingw" for "pathTranslationStyle".
Shown as "MinGW" with translation documented as `(C:\ -> C:/)` in the
UI.
As per the other modes, this translates `\` to `/` but stops there.
There is no prefix/drive translation.

## Validation Steps Performed

Run using `busybox ash` shell. Dragged directories and files from both
local disks and network shares onto terminal. All were appropriately
single quoted and had their backslashes replaced with forward slashes.
They were directly usable by the `ash` shell.

Language files containing the other options have been updated to include
the new one.

## PR Checklist
- [ ] Closes #xxx
- [ ] Tests added/passed
- [x] Documentation updated
   - [Docs PR #849](https://github.com/MicrosoftDocs/terminal/pull/849)
- [ ] Schema updated (if necessary)

Co-authored-by: Adam Butcher <adam@jessamine.uk>

doc/cascadia/profiles.schema.json

@@ -3114,12 +3114,13 @@
         },
         "pathTranslationStyle": {
           "default": "none",
-          "description": "Controls how file paths are transformed when they are dragged and dropped on the terminal. Possible values are \"none\", \"wsl\", \"cygwin\" and \"msys2\".",
+          "description": "Controls how file paths are transformed when they are dragged and dropped on the terminal. Possible values are \"none\", \"wsl\", \"cygwin\", \"msys2\" and \"mingw\".",
           "enum": [
             "none",
             "wsl",
             "cygwin",
-            "msys2"
+            "msys2",
+            "mingw"
           ],
           "type": "string"
         }