Fix duplicate errors for undefined types on resources

[brendandburns]

Summary

• fix #5025 by short-circuiting resource type analysis when the resource type syntax is skipped
• prevent emitting a secondary generic resource-type diagnostic in that scenario
• add unit test coverage for the desired behavior:
  • Missing_resource_type_in_resource_declaration_emits_only_first_type_diagnostic
• include formatter-driven whitespace updates in touched C# files
• include related lockfile updates

Issue

Fixes #5025

Key Changes

• src/Bicep.Core/TypeSystem/DeclaredTypeManager.cs
  • early return in GetDeclaredResourceType(ResourceDeclarationSyntax resource) when resource.Type.IsSkipped
• src/Bicep.Core.UnitTests/Semantics/ResourceDeclarationDiagnosticTests.cs
  • adds regression test asserting only BCP068 is emitted for resource trailingSpace

Validation

• dotnet test src/Bicep.Core.UnitTests/Bicep.Core.UnitTests.csproj --filter "FullyQualifiedName~ResourceDeclarationDiagnosticTests"
• dotnet format --verify-no-changes
• dotnet format style --diagnostics IDE0005 --severity info --verify-no-changes

Microsoft Reviewers: Open in CodeFlow