Fix Git editor reword workflow and UI coverage

- show Git editor file paths instead of the submitted git command
- surface follow-up commit message editors during interactive rebase reword
- add rename-commit UI tests for editor and amend-message solution paths
- add broader embedded level solution scenarios for alternate Git workflows

app/src/main/java/solutions/tretter/githugandroid/levels/RebaseOntoLevel.kt

@@ -44,5 +44,6 @@ internal fun rebaseOntoLevel(): Level = level(
     testCases = listOf(
         levelTestCase("rebase onto explicit branch", "git rebase --onto master wrong_branch readme-update"),
         levelTestCase("rebase onto current branch", "git rebase --onto master wrong_branch"),
+        levelTestCase("rebase onto full branch ref", "git rebase --onto refs/heads/master wrong_branch readme-update"),
     ),
 )