GitHub Actions Cache Isolation [GA]

### Value Prop
Cache Isolation for GitHub Actions gives users and organizations the ability to create secure, partitioned cache environments for their workflows. This feature helps prevent accidental or malicious data leaks between workflows, offering fine-grained control and audit capabilities for enterprise-grade automation.

### Expected Outcome
By isolating caches by repository, workflow, or branch, this update aims to eliminate risks like cache poisoning and data exfiltration, improving the security and reliability of CI/CD pipelines. Customers can expect more trustworthy and predictable workflow runs, with enhanced control over how and when caches are accessed or modified.