Publish profile registry to prod CDN

[liliankasem]

Task

Publish the profile registry files to the prod CDN (cdn.functions.azure.com).

Context

The profile registry is currently only available on staging CDN:

• https://cdn-staging.functions.azure.com/public/cli/v5/profiles/v1/registry.json
• https://cdn-staging.functions.azure.com/public/cli/v5/profiles/v1/registry.json.sha256

The CLI defaults to prod CDN (cdn.functions.azure.com/public/) — see PR #5434. Until this task is done, remote profile fetch will fail gracefully and fall back to the bundled BuiltInProfileSource.

Steps

1. Run the upload pipeline targeting the prod storage account (use $(prod-storage-account-name) / $(prod-storage-access-key) variable groups)
2. Verify files are accessible:
   • https://cdn.functions.azure.com/public/cli/v5/profiles/v1/registry.json
   • https://cdn.functions.azure.com/public/cli/v5/profiles/v1/registry.json.sha256
3. Validate CDN caching headers (Cache-Control, ETag) are configured correctly per design doc (Design: profile updates as part of release pipelines #5329)

Acceptance Criteria

• registry.json and .sha256 are live on prod CDN
• func profile list fetches from prod CDN without needing the env var override