terraform: Add test for complex sensitive values
terraform: Add test for complex sensitive values

When a sensitive variable has a complex type, any traversal of the
variable should still result in a sensitive value. This test uses a
sensitive `map(string)` and verifies that both plan and state output
include the appropriate sensitive marks for the resource attribute.

hashicorp/terraform,apparentlymart/terraform,tommynsong/terraform,rnaveiras/terraform,ewbankkit/terraform,pdecat/terraform,tommynsong/terraform,ewbankkit/terraform,pdecat/terraform,rnaveiras/terraform,pdecat/terraform,apparentlymart/terraform,hashicorp/terraform,apparentlymart/terraform,apparentlymart/terraform,pdecat/terraform,hashicorp/terraform,ewbankkit/terraform,tommynsong/terraform,rnaveiras/terraform,apparentlymart/terraform,ewbankkit/terraform