3388: Remove inlay hint in diff views r=matklad a=vbfox
If the left side of a diff view that contain the old version of the file apply inlays they are misplaced and produce a weird display:
![image](https://user-images.githubusercontent.com/131878/
75628802-
b1ac1900-5bdc-11ea-8c26-
6722d8e38371.png)
After the change:
![image](https://user-images.githubusercontent.com/131878/
75628831-
e91ac580-5bdc-11ea-9039-
c6b4ffbdb2be.png)
The detection is done by blacklisting the url schemes used by git and subversion scm extensions, whitelisting `file` is also possible but neither is perfect as VSCode now support both pluggable scm extensions and pluggable remote filesystems. But I suspect that the list of scm extensions is more easily manageable.
**Note**: I can rebase on #3378 if needed as it touches the same lines of code
Co-authored-by: Julien Roncaglia <julien@roncaglia.fr>