Replace use of testing tools in hashicorp/terraform-plugin-sdk/v2 with hashicorp/terraform-plugin-testing

[SarahFrench]

What kind of contribution is this issue about?

Other (specify in details)

Details

See: https://pkg.go.dev/github.com/hashicorp/terraform-plugin-testing@v1.7.0

This package contains the testing tools for provider, separate from the SDK. By updating the provider to use this package we can avoid issues in acceptance tests

References

No response

[rileykarson]

@trodge had GoogleCloudPlatform/magic-modules#10339 outstanding

[rileykarson]

Blocked on hashicorp/terraform-plugin-testing#327

[melinath]

This is a prerequisite for #12428