#4454 Clean up root test directory tests

Combine cases into smaller tests of tests and remove tests we no longer
need. Linter tests have been moved to where they should be.

test/handler/test_jq_handler.vader

@@ -0,0 +1,18 @@
+Before:
+  runtime ale_linters/json/jq.vim
+
+After:
+  call ale#linter#Reset()
+
+Execute (Should parse error correctly):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 1,
+  \     'col':  9,
+  \     'text': 'Expected another array element',
+  \   }
+  \ ],
+  \ ale_linters#json#jq#Handle(0, [
+  \ 'parse error: Expected another array element at line 1, column 9'
+  \ ])