sagemaker/model_package_group_policy: Fix equivalent policy diffs

[YakDriver]

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Closes #21968
Closes #11801

Output from acceptance testing (us-west-2):

% make testacc TESTS=TestAccSageMakerModelPackageGroupPolicy_ PKG=sagemaker
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/sagemaker/... -v -count 1 -parallel 20 -run='TestAccSageMakerModelPackageGroupPolicy_' -timeout 180m
--- PASS: TestAccSageMakerModelPackageGroupPolicy_basic (25.46s)
--- PASS: TestAccSageMakerModelPackageGroupPolicy_disappears (25.57s)
--- PASS: TestAccSageMakerModelPackageGroupPolicy_Disappears_modelPackageGroup (26.98s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/sagemaker	28.833s

Output from acceptance testing (GovCloud):

% make testacc TESTS=TestAccSageMakerModelPackageGroupPolicy_ PKG=sagemaker
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/sagemaker/... -v -count 1 -parallel 20 -run='TestAccSageMakerModelPackageGroupPolicy_' -timeout 180m
--- SKIP: TestAccSageMakerModelPackageGroupPolicy_disappears (10.89s)
--- SKIP: TestAccSageMakerModelPackageGroupPolicy_Disappears_modelPackageGroup (10.89s)
--- SKIP: TestAccSageMakerModelPackageGroupPolicy_basic (10.90s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/sagemaker	12.514s

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccSageMakerModelPackageGroupPolicy_ PKG=sagemaker
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/sagemaker/... -v -count 1 -parallel 20 -run='TestAccSageMakerModelPackageGroupPolicy_' -timeout 180m
=== RUN   TestAccSageMakerModelPackageGroupPolicy_basic
=== PAUSE TestAccSageMakerModelPackageGroupPolicy_basic
=== RUN   TestAccSageMakerModelPackageGroupPolicy_disappears
=== PAUSE TestAccSageMakerModelPackageGroupPolicy_disappears
=== RUN   TestAccSageMakerModelPackageGroupPolicy_Disappears_modelPackageGroup
=== PAUSE TestAccSageMakerModelPackageGroupPolicy_Disappears_modelPackageGroup
=== CONT  TestAccSageMakerModelPackageGroupPolicy_basic
=== CONT  TestAccSageMakerModelPackageGroupPolicy_Disappears_modelPackageGroup
=== CONT  TestAccSageMakerModelPackageGroupPolicy_disappears
--- PASS: TestAccSageMakerModelPackageGroupPolicy_disappears (18.60s)
--- PASS: TestAccSageMakerModelPackageGroupPolicy_basic (19.85s)
--- PASS: TestAccSageMakerModelPackageGroupPolicy_Disappears_modelPackageGroup (23.46s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/sagemaker	30.080s

[github-actions]

This functionality has been released in v3.70.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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