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/FetchLevel.kt

@@ -49,5 +49,6 @@ internal fun fetchLevel(): Level = level(
     testCases = listOf(
         levelTestCase("fetch origin", "git fetch origin"),
         levelTestCase("fetch default", "git fetch"),
+        levelTestCase("fetch all remotes", "git fetch --all"),
     ),
 )