fix: prevent incorrect "multiple metric batches" warning in tests with pause phases #1950

Job	Run time
generate-matrix-with-packages	8s
test-windows	9m 20s
test (18.x, artillery)	6m 3s
test (18.x, artillery-engine-playwright)	1m 42s
test (18.x, artillery-engine-posthog)	1m 4s
test (18.x, artillery-plugin-apdex)	1m 21s
test (18.x, artillery-plugin-ensure)	2m 3s
test (18.x, artillery-plugin-expect)	1m 31s
test (18.x, artillery-plugin-fake-data)	57s
test (18.x, artillery-plugin-memory-inspector)	1m 41s
test (18.x, artillery-plugin-metrics-by-endpoint)	1m 22s
test (18.x, artillery-plugin-publish-metrics)	1m 2s
test (18.x, artillery-plugin-slack)	59s
test (18.x, @artilleryio/int-commons)	55s
test (18.x, @artilleryio/int-core)	6m 8s
test (18.x, skytrace)	58s
test (18.x, @artilleryio/types)	1m 8s
test (20.x, artillery)	5m 21s
test (20.x, artillery-engine-playwright)	1m 30s
test (20.x, artillery-engine-posthog)	52s
test (20.x, artillery-plugin-apdex)	1m 10s
test (20.x, artillery-plugin-ensure)	2m 2s
test (20.x, artillery-plugin-expect)	1m 24s
test (20.x, artillery-plugin-fake-data)	53s
test (20.x, artillery-plugin-memory-inspector)	1m 34s
test (20.x, artillery-plugin-metrics-by-endpoint)	1m 20s
test (20.x, artillery-plugin-publish-metrics)	50s
test (20.x, artillery-plugin-slack)	1m 21s
test (20.x, @artilleryio/int-commons)	50s
test (20.x, @artilleryio/int-core)	5m 58s
test (20.x, skytrace)	50s
test (20.x, @artilleryio/types)	1m 9s
	1h 5m 26s

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