ci(test): parallelise test suite using gh actions (#3271) #1875

Job	Run time
generate-matrix-with-packages	18s
test (18.x, artillery)	5m 50s
test (18.x, artillery-engine-playwright)	1m 40s
test (18.x, artillery-engine-posthog)	1m 0s
test (18.x, artillery-plugin-apdex)	1m 24s
test (18.x, artillery-plugin-ensure)	2m 2s
test (18.x, artillery-plugin-expect)	1m 30s
test (18.x, artillery-plugin-fake-data)	55s
test (18.x, artillery-plugin-memory-inspector)	1m 36s
test (18.x, artillery-plugin-metrics-by-endpoint)	1m 16s
test (18.x, artillery-plugin-publish-metrics)	1m 1s
test (18.x, artillery-plugin-slack)	52s
test (18.x, @artilleryio/int-commons)	1m 16s
test (18.x, @artilleryio/int-core)	6m 6s
test (18.x, skytrace)	55s
test (18.x, @artilleryio/types)	1m 7s
test (20.x, artillery)	5m 27s
test (20.x, artillery-engine-playwright)	1m 28s
test (20.x, artillery-engine-posthog)	1m 20s
test (20.x, artillery-plugin-apdex)	1m 12s
test (20.x, artillery-plugin-ensure)	2m 2s
test (20.x, artillery-plugin-expect)	1m 24s
test (20.x, artillery-plugin-fake-data)	48s
test (20.x, artillery-plugin-memory-inspector)	1m 41s
test (20.x, artillery-plugin-metrics-by-endpoint)	1m 8s
test (20.x, artillery-plugin-publish-metrics)	53s
test (20.x, artillery-plugin-slack)	52s
test (20.x, @artilleryio/int-commons)	47s
test (20.x, @artilleryio/int-core)	6m 3s
test (20.x, skytrace)	47s
test (20.x, @artilleryio/types)	59s
	55m 39s

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