Use a named remote and branches for staging to help git-lfs
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Description

Use a named remote and branches for staging to help git-lfs

Summary:
I'm working on a fairly large monorepo using phabricator and we are
running into a git-lfs issue. Every single arc diff we have to wait
many seconds while all our lfs files are walked before the push goes through.

I chatted with the git-lfs folks in
https://github.com/git-lfs/git-lfs/issues/4076 and they suggested this workflow
change. I tested it on our repo and it does indeed seem to fix the issue. Three
things were change:

The remote url is named
Use branches instead of tags
Do a git fetch

(Also, hello after all this time! Hope you're all doing well over at phacility.)

Test Plan:
Before

$ arc diff
Linting...
 LINT OKAY  No lint problems.
Running unit tests...
 UNIT OKAY  No unit test failures.
 PUSH STAGING  Pushing changes to staging area...
Uploading LFS objects: 100% (8211/8211), 1.0 GB | 0 B/s, done.
Enumerating objects: 31, done.
Counting objects: 100% (31/31), done.
Delta compression using up to 12 threads
Compressing objects: 100% (21/21), done.
Writing objects: 100% (24/24), 1.77 KiB | 8.00 KiB/s, done.
Total 24 (delta 19), reused 0 (delta 0)
remote: Resolving deltas: 100% (19/19), completed with 6 local objects.
To github.com:robinhoodmarkets/web-staging.git
 * [new tag]             2581578b59b6341c1023377fd8741814e89fcd0c -> phabricator/base/427095
 * [new tag]             7d9be50fbca590f15742d8cc20edd4f082dfbb3b -> phabricator/diff/427095
Updated an existing Differential revision:
        Revision URI: https://phabricator.robinhood.com/D135442

Included changes:
  M       __shared/tools/arcanist-js/src/workflow/RHArcanistDiffWorkflow.php

After

$ arc diff
Linting...
 LINT OKAY  No lint problems.
Running unit tests...
 UNIT OKAY  No unit test failures.
 PUSH STAGING  Pushing changes to staging area...
Enumerating objects: 15, done.
Counting objects: 100% (15/15), done.
Delta compression using up to 12 threads
Compressing objects: 100% (7/7), done.
Writing objects: 100% (8/8), 638 bytes | 2.00 KiB/s, done.
Total 8 (delta 6), reused 0 (delta 0)
remote: Resolving deltas: 100% (6/6), completed with 6 local objects.
To github.com:robinhoodmarkets/web-staging.git
 * [new branch]          2581578b59b6341c1023377fd8741814e89fcd0c -> phabricator/base/427105
 * [new branch]          274cc3a25eb7856291c1d4c078b28b76af8a43b2 -> phabricator/diff/427105
Updated an existing Differential revision:
        Revision URI: https://phabricator.robinhood.com/D135442

Included changes:
  M       __shared/tools/arcanist-js/src/workflow/RHArcanistDiffWorkflow.php