feat: Add code fix for INTL0301/INTL0302 (FavorDirectoryEnumerationCalls)

[BenjaminMichaelis]

No description provided.

[Copilot]

Pull request overview

This pull request adds a code fix provider for the INTL0301 and INTL0302 analyzer rules, which suggest using Directory.EnumerateFiles and Directory.EnumerateDirectories over their GetFiles and GetDirectories counterparts. The code fix automatically replaces these method calls and adds .ToArray() when necessary to maintain type compatibility.

Changes:

• Exposed DiagnosticId constants as public fields in the analyzer for use by the code fix provider
• Implemented a new code fix provider that intelligently replaces method calls and adds ToArray() when the result is assigned to array types
• Added System.Runtime.dll reference to test infrastructure to support System.IO types in tests
• Added comprehensive test cases covering variable assignments and foreach scenarios

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 8 comments.

File	Description
IntelliTect.Analyzer/IntelliTect.Analyzer/Analyzers/FavorDirectoryEnumerationCalls.cs	Extracted diagnostic IDs as public constants and fixed trailing whitespace
IntelliTect.Analyzer/IntelliTect.Analyzer.CodeFixes/FavorDirectoryEnumerationCalls.cs	New code fix provider that replaces GetFiles/GetDirectories with Enumerate variants and conditionally adds ToArray()
IntelliTect.Analyzer/IntelliTect.Analyzer.Test/Helpers/DiagnosticVerifier.Helper.cs	Added System.Runtime.dll metadata reference for test compilation
IntelliTect.Analyzer/IntelliTect.Analyzer.Test/FavorEnumeratorDirectoryCallsTests.cs	Added four test cases covering both diagnostic IDs with array assignment and foreach scenarios

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