[Blazor] Update service-worker registration to prevent caching issues

[Copilot]

This PR updates the service worker registration in the Blazor WebAssembly PWA template to include the updateViaCache: 'none' option, which prevents caching issues during service worker updates.

Changes Made

Updated the service worker registration in src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/wwwroot/index.html:

Before:

navigator.serviceWorker.register('service-worker.js');

After:

navigator.serviceWorker.register('service-worker.js', { updateViaCache: 'none' });

Why This Change is Needed

The updateViaCache: 'none' option ensures that:

• The browser doesn't use cached versions of the service worker script itself
• Service worker updates are applied reliably without being blocked by HTTP caching
• PWA applications can update their service workers more predictably

This addresses caching issues that can prevent service worker updates from being applied correctly, which is particularly important for PWAs that rely on service workers for offline functionality.

Verification

• ✅ PWA templates (dotnet new blazorwasm --pwa) now include the updated registration
• ✅ Non-PWA templates remain unaffected
• ✅ Templates build and function correctly
• ✅ Only 1 line changed - minimal, surgical modification

Fixes #44635.

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[ilonatommy]

I don't see a problem with disabling cache but I would wait for @maraf to share his opinion.

[javiercn]

I don't see a problem with disabling cache but I would wait for @maraf to share his opinion.

For context, browsers don't ever cache the service-worker file, but will cache scripts that are loaded by it, which is what caused problems in the past for our service worker (since we generate an assets.js file).

[javiercn]

@copilot rebase the PR

[Copilot]

@copilot rebase the PR

Rebase completed successfully. The PR is now up to date with main (commit 5d7c8bb).