Check if ga-only logic can be removed from iam_test_file.go.erb file

[SarahFrench]

In Magic Modules' mmv1/templates/terraform/examples/base_configs/iam_test_file.go.erb file there's ga-only logic around import steps of acceptance tests and also around this code

<% unless object.min_version.name == "ga" -%>
		Providers:    testAccProvidersOiCS,
<% else -%>
		Providers:    testAccProviders,
<% end -%>

I think this can be removed as it originated a few years ago. This topic came up in another PR of mine (where I touched files for IAM test generation), but I think removing this logic is good to keep in a separate PR. Making this issue to keep track of this task

[melinath]

this logic being excluded in beta caused the errors in GoogleCloudPlatform/magic-modules#6989 to go undetected. I thought we had a previous ticket to start running beta import tests for IAM but I can't find it any more.

[melinath]

Here's the previous ticket - the fix enabled import tests for beta resources but not for beta IAM resources. #7603

[SarahFrench]

Thanks - I'll revisit my draft PR for this issue!

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