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/CommitAmendLevel.kt

@@ -17,5 +17,7 @@ internal fun commitAmendLevel(): Level = level(
     validator = repoPredicate { repo -> repo.commits.size == 1 && repo.files.any { it.name == "forgotten_file.rb" && it.tracked && !it.staged } },
     testCases = listOf(
         levelTestCase("amend after add", "git add forgotten_file.rb", "git commit --amend --no-edit"),
+        levelTestCase("amend with message option", "git add forgotten_file.rb", "git commit --amend -m \"Initial commit\""),
+        levelTestCase("amend through editor", "git add forgotten_file.rb", "GIT_EDITOR=true git commit --amend"),
     ),
 )