fix: define metric dimensions as strings in A/B ignore list

All EMF dimensions are strings, but the allow list for ignoring block
metrics on m8g due to volatility used integers, causing the ignoring to
fail. Change to strings.

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

Author: roypat

tools/ab_test.py

@@ -53,8 +53,8 @@
     # boot time metrics
     {"performance_test": "test_boottime", "metric": "resume_time"},
     # block throughput on m8g
-    {"fio_engine": "libaio", "vcpus": 2, "instance": "m8g.metal-24xl"},
-    {"fio_engine": "libaio", "vcpus": 2, "instance": "m8g.metal-48xl"},
+    {"fio_engine": "libaio", "vcpus": "2", "instance": "m8g.metal-24xl"},
+    {"fio_engine": "libaio", "vcpus": "2", "instance": "m8g.metal-48xl"},
 ]