Changes

Refactors fork syncing logic to avoid errors when:

• git isn't sync'd yet (due to repository cache)
• simplegit attempts to fetch the list of remotes

Context

#36142

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository