fix api-gateway import tests

[ScottSuarez]

closes hashicorp/terraform-provider-google#9789
closes hashicorp/terraform-provider-google#9782
closes hashicorp/terraform-provider-google#9785

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
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• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

apigateway: fixed import functionality for all `apigateway` resources

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 5 files changed, 23 insertions(+), 23 deletions(-))
Terraform Beta: Diff ( 11 files changed, 38 insertions(+), 50 deletions(-))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccApiGatewayApiIamBindingGenerated|TestAccApiGatewayApiIamPolicyGenerated|TestAccApiGatewayApiIamMemberGenerated|TestAccApiGatewayGatewayIamPolicyGenerated|TestAccApiGatewayGatewayIamBindingGenerated|TestAccApiGatewayGatewayIamMemberGenerated|TestAccComposerEnvironment_update|TestAccComposerEnvironment_withSoftwareConfig You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=201693

[rileykarson]

Hmm- seems like this fixes the resource but breaks IAM.

[ScottSuarez]

should be fixed now

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 5 files changed, 17 insertions(+), 17 deletions(-))
Terraform Beta: Diff ( 9 files changed, 28 insertions(+), 40 deletions(-))

[modular-magician]

Error trying to cancel build ()

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccComposerEnvironment_update|TestAccComposerEnvironment_withSoftwareConfig|TestAccPrivatecaCaPool_privatecaCapoolEmptyBaseline You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=202079