chore: remove deprecated and empty QUnit tests (#27179)

* chore: remove deprecated and empty QUnit tests

* ci: fix UI test config

Testing library was added on Frappe, in order to reuse command testing
library has to be installed during setup process.

erpnext/support/doctype/support_settings/test_support_settings.js

@@ -1,23 +0,0 @@
-/* eslint-disable */
-// rename this file from _test_[name] to test_[name] to activate
-// and remove above this line
-
-QUnit.test("test: Support Settings", function (assert) {
-	let done = assert.async();
-
-	// number of asserts
-	assert.expect(1);
-
-	frappe.run_serially([
-		// insert a new Support Settings
-		() => frappe.tests.make('Support Settings', [
-			// values to be set
-			{key: 'value'}
-		]),
-		() => {
-			assert.equal(cur_frm.doc.key, 'value');
-		},
-		() => done()
-	]);
-
-});