Fix possible concurrent mutation crash

[ileitch]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes a potential concurrent mutation crash by refactoring how Configuration is handled within the test suite. Key changes include:

• Adding a configuration parameter to build and index methods in various test cases.
• Refactoring the Configuration type by removing the reset methods and replacing manual matcher resets with lazy property initializers.
• Updating dependencies and test code to align with the new Configuration usage.

Reviewed Changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Tests/XcodeTests/XcodeSourceGraphTestCase.swift	Updated build method signature to pass a Configuration instance.
Tests/XcodeTests/UIKitProjectTest.swift and SwiftUIProjectTest.swift	Updated build and index calls to include an explicit Configuration.
Tests/Shared/SourceGraphTestCase.swift	Modified index method overloads to accept a configuration parameter.
Tests/Shared/FixtureSourceGraphTestCase.swift	Updated analyze invocations to pass configuration arguments.
Tests/SPMTests/SPMProjectTest.swift and CrossModuleRetentionTest.swift	Updated indexing calls with new configuration parameter.
Tests/AccessibilityTests/RedundantPublicAccessibilityTest.swift	Updated calls from static Self.index() to instance index() methods.
Sources/Configuration/Configuration.swift	Removed the reset methods and matcher cache; replaced with lazy properties.
Package.swift	Added a dependency on the Configuration target.
CHANGELOG.md	Added a changelog entry for the concurrent mutation crash fix.

Files not reviewed (1)

• baselines/linux.json: Language not supported

Comments suppressed due to low confidence (1)

Tests/Shared/SourceGraphTestCase.swift:40

• [nitpick] The overloading of the 'index' method as both a static and instance method with similar signatures might be confusing. Consider consolidating to a single consistent interface to improve clarity when invoking indexing in tests.

func index(sourceFiles: [FilePath]? = nil, configuration: Configuration = .init()) {