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/MergeSquashLevel.kt

@@ -37,5 +37,6 @@ internal fun mergeSquashLevel(): Level = level(
     },
     testCases = listOf(
         levelTestCase("squash merge then commit", "git merge --squash long-feature-branch", "git commit -m \"Merge long feature\""),
+        levelTestCase("squash no commit then commit", "git merge --squash --no-commit long-feature-branch", "git commit -m \"Merge long feature\""),
     ),
 )