feat(mwaa): add `worker_replacement_strategy` variable #361

Job	Run time
terraform-module / CI / Labels Validate	3s
terraform-module / CI / Find modules	3s
terraform-module / CI / Format HCL	22s
terraform-module / CI / bats	37s
terraform-module / CI / Validate Codeowners (syntax)	5s
terraform-module / CI / Validate Codeowners (owners)	0s
terraform-module / Readme	0s
terraform-module / CI / Lint (./examples/complete)	22s
terraform-module / CI / Lint (.)	18s
terraform-module / CI / Lint (./examples/minimal)	17s
terraform-module / ci	2s
terraform-module / Release	0s
	2m 9s

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