rptest: simplify metric_sum filtering

[andrwng]

Follow-up to e567d63 (#16263) to simplify the metrics_sum filtering.

Backports Required

• none - not a bug fix
• none - this is a backport
• none - issue does not exist in previous branches
• none - papercut/not impactful enough to backport
• v23.3.x
• v23.2.x
• v23.1.x

Release Notes

• none

[vbotbuildovich]

new failures in https://buildkite.com/redpanda/redpanda/builds/44232#018d3d3a-e01d-4da6-b947-0224c1e1d921:

"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_identical_hwms.partition_count=5.cloud_storage_type=CloudStorageType.S3"
"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_writes_forbidden.partition_count=10.cloud_storage_type=CloudStorageType.ABS"

new failures in https://buildkite.com/redpanda/redpanda/builds/44232#018d3d3a-e019-4e3e-9366-38d4134ccfb9:

"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_simple_end_to_end.partition_count=10.cloud_storage_type=CloudStorageType.S3"

new failures in https://buildkite.com/redpanda/redpanda/builds/44232#018d3d3a-e020-4d19-b1a3-9213b7a46cfe:

"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_identical_lwms_after_delete_records.partition_count=5.cloud_storage_type=CloudStorageType.S3"
"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_writes_forbidden.partition_count=10.cloud_storage_type=CloudStorageType.S3"

new failures in https://buildkite.com/redpanda/redpanda/builds/44232#018d3d3a-e024-45ae-83fa-5611c1dad854:

"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_simple_end_to_end.partition_count=10.cloud_storage_type=CloudStorageType.ABS"

new failures in https://buildkite.com/redpanda/redpanda/builds/44232#018d3d4d-25bb-4472-8cbb-2773607141c2:

"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_simple_end_to_end.partition_count=10.cloud_storage_type=CloudStorageType.ABS"

new failures in https://buildkite.com/redpanda/redpanda/builds/44232#018d3d4d-25b5-479c-b24d-1fb59974a1c3:

"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_identical_lwms_after_delete_records.partition_count=5.cloud_storage_type=CloudStorageType.S3"
"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_writes_forbidden.partition_count=10.cloud_storage_type=CloudStorageType.S3"

new failures in https://buildkite.com/redpanda/redpanda/builds/44232#018d3d4d-25c0-4e3e-8b3d-d6620e0b616d:

"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_simple_end_to_end.partition_count=10.cloud_storage_type=CloudStorageType.S3"
"rptest.tests.e2e_shadow_indexing_test.EndToEndThrottlingTest.test_throttling.cloud_storage_type=CloudStorageType.ABS"

new failures in https://buildkite.com/redpanda/redpanda/builds/44232#018d3d4d-25c5-491c-8d69-114dc159fbc8:

"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_identical_hwms.partition_count=5.cloud_storage_type=CloudStorageType.S3"
"rptest.tests.read_replica_e2e_test.TestReadReplicaService.test_writes_forbidden.partition_count=10.cloud_storage_type=CloudStorageType.ABS"

new failures in https://buildkite.com/redpanda/redpanda/builds/44249#018d3de0-8b01-4e6d-a8ac-a8225c94c563:

"rptest.tests.e2e_shadow_indexing_test.EndToEndShadowIndexingTestWithDisruptions.test_write_with_node_failures.cloud_storage_type=CloudStorageType.S3"