GYU: Account Notification Settings (#11008)

* Implement new notification settings UI

* Sort new keywords at the front

* Make ts-strict happier

* Make ts-strict happier

* chore: fixed lint issues

* update beta card

* Fix issue with the user settings test

* chore: fixed lint issues

* Add tests for notification settings

* chore: fixed lint issues

* fix: spurious text failures

* improve tests further

* make ts-strict happier

* improve tests further

* Reduce uncovered conditions

* Correct snapshot

* even more test coverage

* Fix an issue with inverted rules

* Update res/css/views/settings/tabs/_SettingsIndent.pcss

Co-authored-by: Šimon Brandner <simon.bra.ag@gmail.com>

* Fix license headers

* Improve i18n

* make linters happier

* Improve beta labels

* improve i18n

* chore: fixed lint issues

* fix: more lint issues

* Update snapshots to match changed text

* Update text as requested

* Remove labs image

* Update snapshots

* Correct an issue with one of the tests

* fix: keyword reconcilation code

* Determine mute status more accurately

* Address review comments

* Prevent duplicate updates

* Fix missing license header

* slight change to avoid ts-strict complaining

* fix test issue caused by previous merge

---------

Co-authored-by: Šimon Brandner <simon.bra.ag@gmail.com>

test/components/views/settings/tabs/user/__snapshots__/LabsUserSettingsTab-test.tsx.snap

@@ -79,6 +79,56 @@ exports[`<LabsUserSettingsTab /> renders settings marked as beta as beta cards 1
         </div>
       </div>
     </div>
+    <div
+      class="mx_BetaCard"
+    >
+      <div
+        class="mx_BetaCard_columns"
+      >
+        <div
+          class="mx_BetaCard_columns_description"
+        >
+          <h3
+            class="mx_BetaCard_title"
+          >
+            <span>
+              Notification Settings
+            </span>
+            <span
+              class="mx_BetaCard_betaPill"
+            >
+              Beta
+            </span>
+          </h3>
+          <div
+            class="mx_BetaCard_caption"
+          >
+            <p>
+              Introducing a simpler way to change your notification settings. Customize your , just the way you like.
+            </p>
+          </div>
+          <div
+            class="mx_BetaCard_buttons"
+          >
+            <div
+              class="mx_AccessibleButton mx_AccessibleButton_hasKind mx_AccessibleButton_kind_primary"
+              role="button"
+              tabindex="0"
+            >
+              Join the beta
+            </div>
+          </div>
+        </div>
+        <div
+          class="mx_BetaCard_columns_image_wrapper"
+        >
+          <img
+            alt=""
+            class="mx_BetaCard_columns_image"
+          />
+        </div>
+      </div>
+    </div>
   </div>
 </div>
 `;