feat(core): specify a Content-Type for individual values when building a formdata request #1935

Job	Run time
generate-matrix-with-packages	9s
test-windows	6m 57s
test (18.x, artillery)	5m 37s
test (18.x, artillery-engine-playwright)	1m 40s
test (18.x, artillery-engine-posthog)	56s
test (18.x, artillery-plugin-apdex)	1m 18s
test (18.x, artillery-plugin-ensure)	2m 10s
test (18.x, artillery-plugin-expect)	1m 35s
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 25s
test (18.x, artillery-plugin-publish-metrics)	1m 0s
test (18.x, artillery-plugin-slack)	1m 1s
test (18.x, @artilleryio/int-commons)	57s
test (18.x, @artilleryio/int-core)	6m 17s
test (18.x, skytrace)	58s
test (18.x, @artilleryio/types)	1m 10s
test (20.x, artillery)	5m 23s
test (20.x, artillery-engine-playwright)	1m 33s
test (20.x, artillery-engine-posthog)	51s
test (20.x, artillery-plugin-apdex)	1m 9s
test (20.x, artillery-plugin-ensure)	1m 55s
test (20.x, artillery-plugin-expect)	1m 25s
test (20.x, artillery-plugin-fake-data)	48s
test (20.x, artillery-plugin-memory-inspector)	1m 33s
test (20.x, artillery-plugin-metrics-by-endpoint)	1m 15s
test (20.x, artillery-plugin-publish-metrics)	50s
test (20.x, artillery-plugin-slack)	50s
test (20.x, @artilleryio/int-commons)	52s
test (20.x, @artilleryio/int-core)	6m 3s
test (20.x, skytrace)	53s
test (20.x, @artilleryio/types)	59s
	1h 2m 7s

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