resource/aws_odb_cloud_vm_cluster: Add system_version argument

[kampilis]

Closes #46880

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

Relations

Closes #0000

References

Output from Acceptance Testing

TF_ACC=1 go test ./internal/service/odb/... -v -count 1 -parallel 2

0 -run='TestAccODBCloudVmCluster_systemVersion' -short -timeout 360m

2026/03/11 21:26:44 Creating Terraform AWS Provider (SDKv2-style)...

2026/03/11 21:26:44 Initializing Terraform AWS Provider (SDKv2-style)...

=== RUN   TestAccODBCloudVmCluster_systemVersion

    cloud_vm_cluster_test.go:338: skipping long-running test in short mode

--- SKIP: TestAccODBCloudVmCluster_systemVersion (0.00s)

PASS

ok      github.com/hashicorp/terraform-provider-aws/internal/service/odb        5.399s
...

[github-actions]

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