feat: Add support for `credentialSpecs` on container definition to enable Windows gMSA #369

Job	Run time
Collect workflow inputs	4s
Max TF pre-commit	2m 59s
Min TF pre-commit (.)	34s
Min TF pre-commit (./examples/ec2-autoscaling)	28s
Min TF pre-commit (./examples/complete)	42s
Min TF pre-commit (./examples/container-definition)	34s
Min TF pre-commit (./modules/container-definition)	51s
Min TF pre-commit (./modules/cluster)	40s
Min TF pre-commit (./examples/fargate)	55s
Min TF pre-commit (./modules/service)	54s
	8m 41s

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