[proposal] Warn google_compute_instance_group without create_before_destroy

[wata727]

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See https://www.terraform.io/docs/providers/google/r/compute_instance_group.html

Recreating an instance group that's in use by another resource will give a resourceInUseByAnotherResource error. You can avoid this error with a Terraform lifecycle block as outlined in the example below.

[PatMyron]

https://github.com/terraform-linters/tflint-ruleset-aws/pull/202

Same thoughts on this as https://github.com/terraform-linters/tflint-ruleset-google/issues/23#issuecomment-1027626936