test(ab): exclude block latency metrics on ARM

they are incredibly volatile on ARM for some reason, with volatility of
up to 151% when ran using the exact same firecracker binary.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tools/ab_test.py

@@ -46,6 +46,13 @@
     {"instance": "m6a.metal", "performance_test": "test_network_tcp_throughput"},
     # Network throughput on m7a.metal
     {"instance": "m7a.metal-48xl", "performance_test": "test_network_tcp_throughput"},
+    # block device latency metrics on ARM
+    {"instance": "m6g.metal", "metric": "clat_read"},
+    {"instance": "m6g.metal", "metric": "clat_write"},
+    {"instance": "m7g.metal", "metric": "clat_read"},
+    {"instance": "m7g.metal", "metric": "clat_write"},
+    {"instance": "m8g-24xl.metal", "metric": "clat_read"},
+    {"instance": "m8g-48xl.metal", "metric": "clat_write"},
 ]