Document breaking change: ProviderAliasAttribute moved to Microsoft.Extensions.Logging.Abstractions

[Copilot]

This PR documents a breaking change in .NET 10 Preview 4 where ProviderAliasAttribute has been moved from the Microsoft.Extensions.Logging namespace to Microsoft.Extensions.Logging.Abstractions.

The changes include:

• Created a new breaking change document at docs/core/compatibility/extensions/10.0/provider-alias-attribute-moved-namespace.md that:

  • Explains the namespace change for ProviderAliasAttribute
  • Documents that the type is type-forwarded from the original location
  • Describes the potential breaking scenario when mixing older versions of Microsoft.Extensions.Logging with .NET 10 version of Microsoft.Extensions.Logging.Abstractions
  • Provides recommended actions for handling the change, including conditional compilation examples

• Updated the reference to ProviderAliasAttribute in docs/core/extensions/custom-logging-provider.md to use the new namespace

• Added the breaking change entry to the table of contents and .NET 10 breaking changes overview

This change allows users who depend on Microsoft.Extensions.Logging.Abstractions and use ProviderAliasAttribute to avoid taking a dependency on the full Microsoft.Extensions.Logging package.

Fixes #45806.

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