[Blazor] Add query string to dotnet.js import for cache busting in .NET 8.0

[Copilot]

This change adds a cache-busting query parameter to the dotnet.js import statement in the Blazor WebAssembly platform code to ensure browsers don't use cached versions from previous .NET releases when upgrading to .NET 8.0.

Problem

When .NET 8.0 is released, browsers may continue to use cached versions of dotnet.js from previous .NET versions, potentially causing compatibility issues or preventing users from getting the latest runtime improvements.

Solution

Modified the default source URL in MonoPlatform.ts to append ?v=8.0 to the dotnet.js URL:

// Before
let src = '_framework/dotnet.js';

// After  
let src = '_framework/dotnet.js?v=8.0';

Impact

• Cache busting: Browsers will download fresh dotnet.js files when .NET 8.0 is deployed instead of using cached versions
• Minimal change: Only affects the default dotnet.js loading path when no custom loadBootResource is provided
• Backwards compatible: Custom loaders remain unaffected and can implement their own cache busting if needed
• Surgical modification: Single line change that follows existing code patterns

The change specifically targets the scenario where the default dotnet.js loading mechanism is used, ensuring a smooth transition for users upgrading to .NET 8.0.

Fixes #63161.

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[javiercn]

@copilot You should do work from the release/8.0 branch and rebase the PR on top of release/8.0

[javiercn]

@copilot rebase the PR on top of release/8.0

[Copilot]

@copilot You should do work from the release/8.0 branch and rebase the PR on top of release/8.0

I've rebased the PR to the release/8.0 branch and adapted the cache busting implementation for the release/8.0 code structure. The change now modifies the default src variable to include the ?v=8.0 query parameter. Commit 257a8ce17

@copilot rebase the PR on top of release/8.0

Done! The PR has been rebased to release/8.0 and the cache busting implementation has been adapted for the release/8.0 branch code structure. Commit 257a8ce17

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• 11vvsblobprodcus336.vsblob.vsassets.io
  • Triggering command: node /usr/local/bin/yarn install (dns block)
• d0svsblobprodcus381.vsblob.vsassets.io
  • Triggering command: node /usr/local/bin/yarn install (dns block)
• frdvsblobprodcus327.vsblob.vsassets.io
  • Triggering command: node /usr/local/bin/yarn install (dns block)
• jrqvsblobprodcus343.vsblob.vsassets.io
  • Triggering command: node /usr/local/bin/yarn install (dns block)
• kijvsblobprodcus387.vsblob.vsassets.io
  • Triggering command: node /usr/local/bin/yarn install (dns block)
• kmuvsblobprodcus389.vsblob.vsassets.io
  • Triggering command: /home/REDACTED/work/aspnetcore/aspnetcore//.dotnet/dotnet msbuild /m /nologo /clp:Summary /v:minimal /nr:true /warnaserror /p:TreatWarningsAsErrors=true /p:ContinuousIntegrationBuild=false /home/REDACTED/work/aspnetcore/aspnetcore/artifacts/toolset/restore.proj /t:__WriteToolsetLocation /clp:ErrorsOnly;NoSummary /p:__ToolsetLocationOutputFile=/home/REDACTED/work/aspnetcore/aspnetcore/artifacts/toolset/8.0.0-beta.25310.3.txt (dns block)
• m6xvsblobprodcus342.vsblob.vsassets.io
  • Triggering command: node /usr/local/bin/yarn install (dns block)
• mfjvsblobprodcus373.vsblob.vsassets.io
  • Triggering command: node /usr/local/bin/yarn install (dns block)
• s4uvsblobprodcus326.vsblob.vsassets.io
  • Triggering command: node /usr/local/bin/yarn install (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[javiercn]

@copilot re-apply the changes