F/ Add support for additional_model_data_sources in aws_sagemaker_model resource

[medhatelhady]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

AWS has functionality to add additional data sources to the model while building an endpoint. This functionality was not implemented in the provider

Relations

Closes #43814

References

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/sagemaker/client/create_model.html

Output from Acceptance Testing

% make testacc TESTS=TestAccSageMakerModel_primaryContainerAdditionalModelDataSources PKG=sagemaker

make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
make: Running acceptance tests on branch: 🌿 f-aws-sagemaker-model-additional-model-data-source 🌿...
TF_ACC=1 go1.24.6 test ./internal/service/sagemaker/... -v -count 1 -parallel 20 -run='TestAccSageMakerModel_primaryContainerAdditionalModelDataSources'  -timeout 360m -vet=off
2025/09/23 01:20:22 Creating Terraform AWS Provider (SDKv2-style)...
2025/09/23 01:20:22 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccSageMakerModel_primaryContainerAdditionalModelDataSources
=== PAUSE TestAccSageMakerModel_primaryContainerAdditionalModelDataSources
=== CONT  TestAccSageMakerModel_primaryContainerAdditionalModelDataSources
--- PASS: TestAccSageMakerModel_primaryContainerAdditionalModelDataSources (60.83s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/sagemaker  61.046s
...

[github-actions]

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