api/internal/git: handle .git suffix in repospec

[zhouhaibing089]

This change adds a new test case for parsing url with .git suffix. In
that case, we should have the full url as clone spec with an empty
abspath.

This fixes #4011.

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[brianpursley]

/ok-to-test

[natasha41575]

/lgtm

Waiting for tests to pass before approving

[natasha41575]

/approve

Thank you!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brianpursley, natasha41575, zhouhaibing089

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