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

test/unit-tests/components/structures/__snapshots__/ThreadPanel-test.tsx.snap

@@ -7,7 +7,8 @@ exports[`ThreadPanel Header expect that All filter for ThreadPanelHeader properl
   >
     <button
       aria-labelledby="«r0»"
-      class="_icon-button_m2erp_8"
+      class="_icon-button_1pz9o_8"
+      data-kind="primary"
       role="button"
       style="--cpd-icon-button-size: 28px;"
       tabindex="0"
@@ -45,7 +46,8 @@ exports[`ThreadPanel Header expect that My filter for ThreadPanelHeader properly
   >
     <button
       aria-labelledby="«r6»"
-      class="_icon-button_m2erp_8"
+      class="_icon-button_1pz9o_8"
+      data-kind="primary"
       role="button"
       style="--cpd-icon-button-size: 28px;"
       tabindex="0"