[New Resource] aws_sagemaker_cluster for Sagemaker Hyperpod Cluster

[talaha3]

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

This PR introduces a new resource to support the AWS Sagemaker Hyperpod Cluster service. It contains the documentation, the implementation and working acceptance tests for the resource.

Relations

References

Output from Acceptance Testing

% make testacc TESTS=TestAccSageMakerCluster PKG=sagemaker
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.24.4 test ./internal/service/sagemaker/... -v -count 1 -parallel 20 -run='TestAccSageMakerCluster'  -timeout 360m -vet=off
2025/07/17 16:28:24 Creating Terraform AWS Provider (SDKv2-style)...
2025/07/17 16:28:24 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccSageMakerCluster_basic
=== PAUSE TestAccSageMakerCluster_basic
=== RUN   TestAccSageMakerCluster_disappears
=== PAUSE TestAccSageMakerCluster_disappears
=== RUN   TestAccSageMakerCluster_tags
=== PAUSE TestAccSageMakerCluster_tags
=== RUN   TestAccSageMakerCluster_updateInstanceGroups
=== PAUSE TestAccSageMakerCluster_updateInstanceGroups
=== RUN   TestAccSageMakerCluster_forceReplacement
=== PAUSE TestAccSageMakerCluster_forceReplacement
=== CONT  TestAccSageMakerCluster_basic
=== CONT  TestAccSageMakerCluster_updateInstanceGroups
=== CONT  TestAccSageMakerCluster_tags
=== CONT  TestAccSageMakerCluster_disappears
=== CONT  TestAccSageMakerCluster_forceReplacement
--- PASS: TestAccSageMakerCluster_basic (360.83s)
--- PASS: TestAccSageMakerCluster_disappears (410.96s)
--- PASS: TestAccSageMakerCluster_tags (471.06s)
--- PASS: TestAccSageMakerCluster_updateInstanceGroups (574.54s)
--- PASS: TestAccSageMakerCluster_forceReplacement (712.10s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/sagemaker  717.391s
...

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[justinretzolk]

A quick initial review during triage: we won't need this new-guide entry

Suggested change

	```release-note:new-guide
	AWS: aws_sagemaker_cluster
	```