Add ability to use ddtrace_serverless wheels in layer build #554

Job	Run time
build	1m 2s
system-tests / Get parameters / Get parameters	12s
system-tests / Build end-to-end (function-url)	1m 14s
system-tests / Build end-to-end (apigw-rest)	1m 15s
system-tests / Build end-to-end (alb-multi)	1m 11s
system-tests / Build end-to-end (alb)	1m 8s
system-tests / Build end-to-end (apigw-http)	1m 7s
system-tests / parametric	-1s
system-tests / End-to-end #1 / alb 1	3m 22s
system-tests / End-to-end #1 / alb-multi 1	3m 8s
system-tests / End-to-end #1 / apigw-http 1	3m 17s
system-tests / End-to-end #1 / apigw-rest 1	3m 9s
system-tests / End-to-end #1 / function-url 1	4m 8s
system-tests / Report failures	0s
	24m 12s

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