Fixes #1045 - Take UNC path from query instead of uri

[mikes-gh]

Description

When UNC path is used for a repo the gitUri is formatted without the double slash.

The following example is from a repo on //aesrocc/home/ROCCTEST

gitlens://0cee44d/aesrocc/home/ROCCTEST/fldedit/invfe53gst.et?{"path":"//aesrocc/home/ROCCTEST/fldedit/invfe53gst.et","ref":"0cee44d88243c4180f17837d9adf3b43a231ead2","repoPath":"//aesrocc/home/ROCCTEST"}
\_____/   \_____/\__________________________________________/ \___________________________________________________________________________________________________________________________________________/ 
   |        |            |                                                                                 |
scheme     authority       path                                                                 query   

The uri strips the //

uri.path = /aesrocc/home/ROCCTEST/fldedit/invfe53gst.et

but the path is still correct in the path element of the query string and should be reliable on all file systems

data.path = //aesrocc/home/ROCCTEST/fldedit/invfe53gst.et (from query)

Checklist

• I have followed the guidelines in the Contributing document
• My changes follow the coding style of this project
• My changes build without any errors or warnings
• My changes have been formatted and linted
• My changes include any required corresponding changes to the documentation
• My changes have been rebased and squashed to the minimal number (typically 1) of relevant commits
• My changes have a descriptive commit message with a short title, including a Fixes $XXX - or Closes #XXX - prefix to auto-close the issue that your PR addresses

[mikes-gh]

Probably also fixes #1087

[eamodio]

@mikes-gh I put a patch in for this, although I think it is more of a band-aid than the root cause. I feel like the root cause is in here: https://github.com/eamodio/vscode-gitlens/blob/67a2c92f7967475e26df2afefc59ee2d44229923/src/git/gitUri.ts#L462-L510

Can you see if that is where the leading // is getting missed?

[mikes-gh]

Yes I already debugged that area. The UNC path is correct there its further on in the process.
I am going to look at fsProvider.ts next

[mikes-gh]

It seems the path is good with double slash upto
https://github.com/eamodio/vscode-gitlens/blob/b2859eccad6d4a3a7916e0f312e42392e6b51e52/src/commands/diffWith.ts#L169
When vscode.diff is run it calls back into the gitlens fsprovider and the uris somehow now miss the double slash??
Maybe the uri is rationalised in between.