cmd/gitannex: Replace e2e test script with Go test

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This commit implements milestone 2.1 for the gitannex subcommand:
https://github.com/rclone/rclone/issues/7625#issuecomment-1951403856

This rewrite makes a few improvements over the old shell script:

(1) It no longer uses the system's rclone.conf. Now, it writes the
    rclone.conf file in an ephemeral directory.

(2) It no longer makes any assumptions about the contents of /tmp.

However, it now assumes that an rclone built from the HEAD commit is on
the PATH. It makes a best-effort attempt to verify this assumption, but
I'm not sure it's bulletproof.

I'm hoping that writing this in Go will enable more cross-platform
support in the future, but for now we're still restricted to Unixy
systems due to reliance on the HOME environment variable.

Issue #7625

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