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/PushBranchLevel.kt

@@ -45,5 +45,6 @@ internal fun pushBranchLevel(): Level = level(
     testCases = listOf(
         levelTestCase("push named branch", "git push origin test_branch"),
         levelTestCase("push current branch refspec", "git push origin test_branch:test_branch"),
+        levelTestCase("push fully qualified branch refspec", "git push origin refs/heads/test_branch:refs/heads/test_branch"),
     ),
 )