Make Microsoft.AspNetCore.TestHost package compatible with .NET6 (#1084) #13

Job	Run time
build_and_push_images (./src/adservice/Dockerfile, adservice, ./)	11s
build_and_push_images (./src/cartservice/src/Dockerfile, cartservice, ./)	18s
build_and_push_images (./src/checkoutservice/Dockerfile, checkoutservice, ./)	10s
build_and_push_images (./src/currencyservice/Dockerfile, currencyservice, ./src/currencyservice)	12s
build_and_push_images (./src/emailservice/Dockerfile, emailservice, ./src/emailservice)	10s
build_and_push_images (./src/frontend/Dockerfile, frontend, ./)	10s
build_and_push_images (./src/frontendproxy/Dockerfile, frontendproxy, ./)	12s
build_and_push_images (./src/loadgenerator/Dockerfile, loadgenerator, ./)	10s
build_and_push_images (./src/paymentservice/Dockerfile, paymentservice, ./)	12s
build_and_push_images (./src/productcatalogservice/Dockerfile, productcatalogservice, ./)	16s
build_and_push_images (./src/quoteservice/Dockerfile, quoteservice, ./)	11s
build_and_push_images (./src/shippingservice/Dockerfile, shippingservice, ./)	11s
build_and_push_images (./src/recommendationservice/Dockerfile, recommendationservice, ./)	10s
build_and_push_images (./src/kafka/Dockerfile, kafka, ./)	10s
build_and_push_images (./src/accountingservice/Dockerfile, accountingservice, ./)	13s
build_and_push_images (./src/frauddetectionservice/Dockerfile, frauddetectionservice, ./)	18s
build_and_push_images (./src/frontend/Dockerfile.cypress, frontend-tests, ./)	11s
build_and_push_images (./test/Dockerfile, integrationTests, ./)	16s
	3m 41s

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