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/test/java/solutions/tretter/githugandroid/GitEditorCommandsTest.kt

@@ -11,6 +11,7 @@ class GitEditorCommandsTest {
 
         assertEquals(GitEditorCommandKind.COMMIT_MESSAGE, invocation?.kind)
         assertEquals("Edit Commit Message", invocation?.title)
+        assertEquals(".git/COMMIT_EDITMSG", invocation?.displayPath)
     }
 
     @Test
@@ -34,6 +35,7 @@ class GitEditorCommandsTest {
 
         assertEquals(GitEditorCommandKind.REBASE_TODO, invocation?.kind)
         assertEquals("Edit Rebase Todo", invocation?.title)
+        assertEquals(".git/rebase-merge/git-rebase-todo", invocation?.displayPath)
     }
 
     @Test
@@ -47,6 +49,7 @@ class GitEditorCommandsTest {
 
         assertEquals(GitEditorCommandKind.TAG_MESSAGE, invocation?.kind)
         assertEquals("Edit Tag Message", invocation?.title)
+        assertEquals(".git/TAG_EDITMSG", invocation?.displayPath)
     }
 
     @Test