Fix SageMaker Endpoint IAM Policy Syntax

[sureshc]

Fix forward for #58202

Testing story

Validate CloudFormation template:

suresh@CloichnaCoillte code-dot-org % bundle exec rake adhoc:validate RAILS_ENV=adhoc STACK_NAME=adhoc-fix-sagemaker-policy


Finished adhoc:environment (less than a minute)
Pending create for stack `adhoc-fix-sagemaker-policy`:
Add BrowserEventLogsStream [AWS::Logs::LogStream]
Add BrowserEventLogs [AWS::Logs::LogGroup]
Add CDOPolicy [AWS::IAM::ManagedPolicy]
Add ChefConfig [AWS::SecretsManager::Secret]
Add DBClusterIDConfig [AWS::SecretsManager::Secret]
Add DBProxyReaderEndpointConfig [AWS::SecretsManager::Secret]
Add DBProxyReportingEndpointConfig [AWS::SecretsManager::Secret]
Add DBProxyWriterEndpointConfig [AWS::SecretsManager::Secret]
Add DBWriterEndpointConfig [AWS::SecretsManager::Secret]
Add DaemonInstanceProfile [AWS::IAM::InstanceProfile]
Add DaemonRole [AWS::IAM::Role]
Add DashboardDNS [AWS::Route53::RecordSetGroup]
Add DatabaseSecretAdmin [AWS::SecretsManager::Secret]
Add DatabaseSecretReader [AWS::SecretsManager::Secret]
Add DatabaseSecretWriter [AWS::SecretsManager::Secret]
Add HourOfCodeCertificate [AWS::CertificateManager::Certificate]
Add PegasusDNS [AWS::Route53::RecordSetGroup]
Add WebServer [AWS::EC2::Instance]
Finished adhoc:validate (less than a minute)

Deployment strategy

Follow-up work

Privacy

Security

Caching

PR Checklist:

• Tests provide adequate coverage
• Privacy and Security impacts have been assessed
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Pull Request is labeled appropriately
• Follow-up work items (including potential tech debt) are tracked and linked