Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

After file extension change done in #43756, Web Manifest is no longer added to offline cache.
Prior to this change it had json extension which is included.

Expected Behavior

Web Manifest should be added to offline cache by default service worker implementation.

Steps To Reproduce

• Create new project from Blazor template, with PWA option selected.
• Run published app and let service worker install.
• Check if manifest.webmanifest is in offline cache

Exceptions (if any)

No response

.NET Version

No response

Anything else?

Adding /\.webmanifest$/ to offlineAssetsInclude in service-worker.published.js should fix this.