test(downloader): record TODO(phase-d) reasons and port two git-downloader tests

zip/git/file downloader tests that were already #[ignore]d for a
documented reason lacked the required in-body // TODO(phase-d)
comment; record it for each.

Two git_downloader_test.rs cases,
test_download_uses_various_protocols_and_sets_push_url_for_github and
test_update_doesnt_throws_runtime_exception_if_git_command_fails_at_first_but_is_able_to_recover,
had been left as todo!() with a TODO(phase-d) claiming
ComposerMirror::process_git_url's github regex lacks PCRE delimiters
and panics. That regex already has delimiters and does not panic
(verified directly), and other tests in this same file already use
Package::set_source_mirrors to give a real package a mirror-prefixed
getSourceUrls() list, so the stated blocker no longer applies. Port
both tests using that existing technique instead of recording a
TODO(phase-d) for them.

No other test logic changes.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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