#4454 Clean up more tests and code

* Remove some tests we no longer need
* Delete blocks of redundant code
* Compress some tests together to simplify them
* Remove a little code for ancient linter versions
* Escape more executables we didn't escape before
* Rename a deno option that didn't match our conventions

test/handler/test_luac_handler.vader

@@ -33,4 +33,3 @@ Execute(The luac handler should parse lines correctly):
   \   'luac /file/path/here.lua:3: unexpected symbol near ''-''',
   \   'luac /file/path/here.lua:5: ''='' expected near '')''',
   \ ])
-