JS: Remove misspelled directive test cases

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jketema

javascript/ql/test/query-tests/Expressions/UnknownDirective/UnknownDirective.expected

@@ -15,5 +15,3 @@
 | UnknownDirective.js:44:5:44:65 | "[0, 0, ... , 0];"; | Unknown directive: '[0, 0, 0, 0, 0, 0, 0 ... (truncated)'. |
 | UnknownDirective.js:50:5:50:15 | ":nomunge"; | Unknown directive: ':nomunge'. |
 | UnknownDirective.js:51:5:51:30 | "foo(), ... munge"; | Unknown directive: 'foo(), bar, baz:nomu ... (truncated)'. |
-| UnknownDirective.js:69:5:69:20 | "use workflows"; | Unknown directive: 'use workflows'. |
-| UnknownDirective.js:70:5:70:16 | "use steps"; | Unknown directive: 'use steps'. |

javascript/ql/test/query-tests/Expressions/UnknownDirective/UnknownDirective.js

@@ -64,8 +64,3 @@ async function step() {
     "use step";
     return 42;
 }
-
-function workflowTypos() {
-    "use workflows"; // $ Alert
-    "use steps"; // $ Alert
-}