Add notification dots to thread summary icons (#12146)

* Add notification dots to thread summary icons

Adopts new IndicatorIcon from compound to have threads icons with
indicator dot (that aren't also buttons). Adds green & red dots on
the threads icon in the thread summary to indicate notifications.
Changes the notification level dots colours in the threads panel to
be green to match.

* Update test for new CSS class

* Update snapshots with new class name

* Another snapshot update for new class name

* Replace more uses of old class name in tests

* More snapshot updates for new class name

* Unsure how this ever worked in chronological mode

* More snapshot updates

* Fix dot colours

* Upgrade to compound-web 3

* Fix computed notification levels

* Add test for notificationLevelToIndicator

package.json

@@ -74,7 +74,7 @@
         "@sentry/browser": "^7.0.0",
         "@testing-library/react-hooks": "^8.0.1",
         "@vector-im/compound-design-tokens": "^0.1.0",
-        "@vector-im/compound-web": "2.0.0",
+        "@vector-im/compound-web": "3.0.0",
         "@zxcvbn-ts/core": "^3.0.4",
         "@zxcvbn-ts/language-common": "^3.0.4",
         "@zxcvbn-ts/language-en": "^3.0.2",