[fenix] Bug 1814208 - Enable speedometer3 in the fenix branch. (https://github.com/mozilla-mobile/fenix/pull/28717)

* Bug 1814208 - Enable speedometer3 in the fenix branch.

* Undo testing changes.

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Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

taskcluster/ci/browsertime/kind.yml

@@ -133,6 +133,12 @@ tasks:
             - [youtube-watch, youtube-w]
             - allrecipes
 
+    speedometer3:
+        description: "Raptor Speedometer 3 Benchmark tests on Fenix"
+        test-name: speedometer3
+        run-visual-metrics: False
+        chimera: False
+
     youtube-playback-av1-sfr:
         description: "Raptor YouTube Playback AV1 SFR on Fenix"
         test-name: youtube-playback-av1-sfr