feat: Add support for `credentialSpecs` on container definition to enable Windows gMSA #374

Job	Run time
Collect workflow inputs	3s
Max TF pre-commit	1m 41s
Min TF pre-commit (./examples/ec2-autoscaling)	28s
Min TF pre-commit (.)	34s
Min TF pre-commit (./examples/fargate)	34s
Min TF pre-commit (./examples/container-definition)	29s
Min TF pre-commit (./modules/container-definition)	37s
Min TF pre-commit (./modules/cluster)	36s
Min TF pre-commit (./modules/service)	30s
Min TF pre-commit (./examples/complete)	37s
	6m 9s

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