feat: Add global message search (#1385)

* feat: Search messages by content

* Fix search UI

* Add specs

* chore: Filter search results

* Update highlight logic

* Rename query to searchTerm

Co-authored-by: Sojan <sojan@pepalo.com>

app/javascript/dashboard/store/modules/specs/conversationSearch/getters.spec.js

@@ -0,0 +1,19 @@
+import { getters } from '../../conversationSearch';
+
+describe('#getters', () => {
+  it('getConversations', () => {
+    const state = {
+      records: [{ id: 1, messages: [{ id: 1, content: 'value' }] }],
+    };
+    expect(getters.getConversations(state)).toEqual([
+      { id: 1, messages: [{ id: 1, content: 'value' }] },
+    ]);
+  });
+
+  it('getUIFlags', () => {
+    const state = {
+      uiFlags: { isFetching: false },
+    };
+    expect(getters.getUIFlags(state)).toEqual({ isFetching: false });
+  });
+});