Revert "ci: Disable A/B tests failing on m6i.metal 5.10"

This reverts commit a844915.

Signed-off-by: Sudan Landge <sudanl@amazon.com>

Author: JonathanWoollett-Light

tools/ab_test.py

@@ -49,11 +49,6 @@
         "host_kernel": "linux-5.10",
         "vcpus": "1",
     },
-    # High volatility due to AMI.
-    {
-        "instance": "m6i.metal",
-        "host_kernel": "linux-5.10",
-    },
 ]