Improve pipeline security tab filter logic

What does this MR do?

This MR addresses the feedback left in !47294 (merged). The previous MR was merged quickly in order to fix a priority1 bug. This MR fixes the issues brought up in that MR, but were marked to be fixed in a follow-up.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• [-] Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

ee/spec/frontend/security_dashboard/store/modules/filters/actions_spec.js

 import testAction from 'helpers/vuex_action_helper';
-import createState from 'ee/security_dashboard/store/modules/filters/state';
 import * as types from 'ee/security_dashboard/store/modules/filters/mutation_types';
 import * as actions from 'ee/security_dashboard/store/modules/filters/actions';
 import { DISMISSAL_STATES } from 'ee/security_dashboard/store/modules/filters/constants';
@@ -15,14 +14,21 @@ describe('filters actions', () => {
   });
 
   describe('setFilter', () => {
-    it('should commit the SET_FILTER mutation', () => {
-      const state = createState();
-      const payload = { reportType: ['SAST'] };
+    it('should commit the SET_FILTER mutation with the right casing', () => {
+      const payload = {
+        oneWord: ['ABC', 'DEF'],
+        twoWords: ['123', '456'],
+        threeTotalWords: ['Abc123', 'dEF456'],
+      };
 
-      return testAction(actions.setFilter, payload, state, [
+      return testAction(actions.setFilter, payload, undefined, [
         {
           type: types.SET_FILTER,
-          payload: { report_type: ['sast'] },
+          payload: {
+            one_word: ['abc', 'def'],
+            two_words: ['123', '456'],
+            three_total_words: ['abc123', 'def456'],
+          },
         },
       ]);
     });
@@ -36,9 +42,7 @@ describe('filters actions', () => {
     `(
       'should commit the SET_HIDE_DISMISSED mutation with "$expected" when called with $isHidden',
       ({ isHidden, expected }) => {
-        const state = createState();
-
-        return testAction(actions.setHideDismissed, isHidden, state, [
+        return testAction(actions.setHideDismissed, isHidden, undefined, [
           {
             type: types.SET_HIDE_DISMISSED,
             payload: expected,