refactor(git): simplify names in git test

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PR Overview

This pull request refactors test cases in the git module by simplifying variable names.

• Renames variables from "remoteRepo" to "remote" for improved consistency and brevity.
• Updates corresponding references to ensure the tests use the new naming convention.

Reviewed Changes

File	Description
core/git/git.test.ts	Simplifies test repository variable names for clarity.

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core/git/git.test.ts:28

• [nitpick] The refactor renames 'remoteRepo' to 'remote' for brevity; however, the name 'remote' might be a bit generic in a test context, especially when interfacing with repo.remotes. Consider using a slightly more descriptive name such as 'tempRemote' to avoid any ambiguity.

await using remote = await tempRepository();