Update Core Subnets Creation and upgrade core Terraform to 4.14.0 #7977

Job	Run time
PR comment	4s
Destroy PR env	0s
Destroy branch env	0s
Deploy PR / Deploy Management	3m 27s
Deploy PR / Start TRE	0s
Deploy PR / Publish Bundles	0s
Deploy PR / Build Core Docker Images	0s
Deploy PR / Publish Shared Bundles	0s
Deploy PR / Deploy TRE	0s
Deploy PR / Deploy UI	0s
Deploy PR / Register Shared Bundles	0s
Deploy PR / Register Bundles	0s
Deploy PR / Deploy shared services	0s
Deploy PR / Register User Resource Bundles	0s
Deploy PR / Run E2E Tests (Smoke)	0s
Deploy PR / Run E2E Tests	0s
Deploy PR / Summary	10s
	3m 41s

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