Document FileConfigurationProvider reload-token behavior after ignored load failures

[Copilot]

In .NET 11 Preview 7, FileConfigurationProvider no longer fires its reload token when Load() fails and OnLoadException ignores the exception. The change affects consumers that treat an ignored load failure as a reload notification.

• Breaking-change article

  • Documents previous and new behavior, rationale, recommended action, and affected file-based configuration providers.
  • Links to the runtime control-flow fix.

• Compatibility navigation

  • Adds the article to the .NET 11 Extensions compatibility index and TOC.

source.OnLoadException = context =>
{
    context.Ignore = true;
    // In .NET 11, GetReloadToken() doesn't fire after this ignored failure.
};

• Fixes [Breaking change]: FileConfigurationProvider.OnReload is not called when Load() fails #55023

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Internal previews

File	Preview link
docs/core/compatibility/11.md	docs/core/compatibility/11
docs/core/compatibility/extensions/11/fileconfigurationprovider-reload-token-load-failure.md	docs/core/compatibility/extensions/11/fileconfigurationprovider-reload-token-load-failure
docs/core/compatibility/toc.yml	docs/core/compatibility/toc

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