[Blazor] Remove HotReload built-into Blazor WebAssembly

[Copilot]

Do not merge before dotnet/sdk#49800

This PR removes the built-in HotReload functionality from Blazor WebAssembly as requested in the issue.

Changes Made

Removed Files

• src/Components/WebAssembly/WebAssembly/src/HotReload/WebAssemblyHotReload.cs - The main HotReload implementation class
• src/Components/WebAssembly/WebAssembly/src/HotReload/ - Empty directory after file removal

Updated Files

• PublicAPI.Shipped.txt - Removed 3 HotReload-related public API entries:

  • Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload
  • ApplyHotReloadDelta method
  • GetApplyUpdateCapabilities method

• PublicAPI.Unshipped.txt - Removed 19 HotReload-related entries:

  • WebAssemblyHotReload.Delta struct and all its properties
  • WebAssemblyHotReload.LogEntry struct and all its properties
  • ApplyHotReloadDeltas method

• Boot.WebAssembly.Common.ts - Removed JavaScript interop methods:

  • applyHotReload (obsolete method)
  • applyHotReloadDeltas
  • getApplyUpdateCapabilities

• GlobalExports.ts - Removed TypeScript interface definitions for the removed methods

• WebAssemblyHost.cs - Removed:

  • using Microsoft.AspNetCore.Components.WebAssembly.HotReload;
  • using System.Reflection.Metadata; (now unused)
  • HotReload initialization code block

• Microsoft.AspNetCore.Components.WebAssembly.props - Removed WebAssemblyHotReloadCapabilities property

Impact

This is a clean removal of the self-contained WebAssembly HotReload functionality without affecting:

• The general hot reload infrastructure used by other Blazor modes
• Any existing applications (the functionality was internal/framework-only)
• Build or runtime behavior for WebAssembly applications

Testing

• WebAssembly project builds successfully without errors
• Verified no remaining references to removed functionality in source code
• Confirmed all targeted files and directories are properly cleaned up

Fixes #62776.
Fixes #62371.
Contributes to #61272

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[Copilot]

Pull Request Overview

This PR removes the built-in HotReload functionality from Blazor WebAssembly.

• Deletes the WebAssemblyHotReload implementation and its initialization.
• Cleans up related MSBuild property and public API entries.
• Removes JavaScript/TypeScript interop methods for HotReload.

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Microsoft.AspNetCore.Components.WebAssembly.props	Removed WebAssemblyHotReloadCapabilities MSBuild property
PublicAPI.Unshipped.txt	Removed HotReload API entries
PublicAPI.Shipped.txt	Removed HotReload API entries
HotReload/WebAssemblyHotReload.cs	Deleted the entire HotReload implementation class
Hosting/WebAssemblyHost.cs	Removed HotReload initialization block and unused usings
src/Components/Web.JS/src/GlobalExports.ts	Removed TypeScript interface definitions for HotReload
src/Components/Web.JS/src/Boot.WebAssembly.Common.ts	Removed JavaScript interop methods for HotReload

[maraf]

Instead of removing APIs from here, mark them as removed in PublicAPI.Unshipped.txt

Documentation says:

Removed APIs

A new entry needs to be added to the PublicAPI.Unshipped.txt file for a removed API. For example:

#nullable enable
*REMOVED*Microsoft.Builder.OldApplicationBuilder.New() -> Microsoft.AspNetCore.Builder.IApplicationBuilder!

[Copilot]

Fixed in commit 2805982. The HotReload APIs are now marked as REMOVED in PublicAPI.Unshipped.txt instead of being deleted from PublicAPI.Shipped.txt.

[maraf]

/ba-g KestrelMetricsTests.Http1Connection_ServerShutdown_Abort and template test failures are unrelated