Tatsh / livecheck / 26271304527

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tests: cover update_egit_branch and github branch-resolution edges

Close the remaining branch-coverage gaps that PR #476's new code left
behind, bringing total coverage back to 100% (3023/3023 statements,
1150/1150 branches).

- `update_egit_branch`: assert the loop-completes-without-match path
  when an ebuild contains neither `EGIT_COMMIT` nor `EGIT_REPO_URI`,
  and the empty-branch early-return.
- `_github_version_branch_candidates` via the public
  `get_github_branch_for_commit`: drive the non-numeric-version
  single-candidate branch with a `'main'` version.
- `get_github_branch_for_commit`: cover the missing-owner-or-repo
  early return, the `get_content`-returns-falsy continue path, the
  unreachable-compare-status continue path, and the terminal
  no-candidate-matches return.

All seven new tests exercise the documented contracts through the
public API; no private symbols are imported or patched per project
test rules.

Signed-off-by: Andrew Udvare <audvare@gmail.com>

575 of 575 branches covered (100.0%)

Branch coverage included in aggregate %.

3023 of 3023 relevant lines covered (100.0%)

5.0 hits per line