Update IconButton colors (#30124)

* chore: update `@vector-im/compound-web` to 8.0.0

* refactor(IconButton): use `kind="secondary"` instead of `subtleBackground` props

* test: update snapshots

* fix: force color on room header toggle

* fix: TAC button color

* test(e2e): update release announcement screenshot

package.json

@@ -93,7 +93,7 @@
         "@types/png-chunks-extract": "^1.0.2",
         "@types/react-virtualized": "^9.21.30",
         "@vector-im/compound-design-tokens": "^4.0.0",
-        "@vector-im/compound-web": "^7.11.0",
+        "@vector-im/compound-web": "^8.0.0",
         "@vector-im/matrix-wysiwyg": "2.38.3",
         "@zxcvbn-ts/core": "^3.0.4",
         "@zxcvbn-ts/language-common": "^3.0.4",