Apply fixes from tooling updates

[spawnia]

No description provided.

[Copilot]

Pull request overview

Updates the codebase to align with newer tooling/linting expectations, primarily by standardizing PHP anonymous class instantiation syntax and PHPUnit assertion style, plus relocating two @hasMany directive tests to the integration suite where they better fit.

Changes:

• Normalize anonymous class instantiation style (new class ...) across tests and service provider binding.
• Replace fully-qualified \PHPUnit\Framework\Assert::... calls with $this->... / self::... assertions where appropriate.
• Move HasManyDirectiveTest coverage from tests/Unit into tests/Integration (and add the required imports).

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/Unit/Subscriptions/SubscriptionTest.php	Anonymous class syntax update in subscription registration test.
tests/Unit/Subscriptions/BroadcastDriverManagerTest.php	Anonymous class syntax update and PHPUnit assertion style normalization.
tests/Unit/Scout/ScoutEnhancerTest.php	Anonymous class syntax updates for directive fixtures.
tests/Unit/Schema/Directives/ThrottleDirectiveTest.php	Anonymous class syntax update for CreatesContext test double.
tests/Unit/Schema/Directives/HasManyDirectiveTest.php	Removes unit-level @hasMany tests (moved to integration).
tests/Unit/Schema/Directives/BaseDirectiveTest.php	Anonymous class syntax update for directive fixture.
tests/Unit/Schema/DirectiveLocatorTest.php	Anonymous class syntax update for directive fixture.
tests/Unit/Schema/AST/ASTHelperTest.php	Anonymous class syntax updates for directive fixtures.
tests/Unit/Schema/AST/ASTBuilderTest.php	Anonymous class syntax updates for directive fixtures.
tests/Unit/Execution/ResolveInfoTest.php	Anonymous class syntax updates for directive fixtures and ResolveInfo test double.
tests/Unit/Execution/CreatesContextTest.php	Anonymous class syntax update and assertion style normalization inside resolver mock.
tests/Unit/Auth/CanRootDirectiveTest.php	Anonymous class syntax update for return object fixture.
tests/Unit/Auth/CanResolvedDirectiveTest.php	Anonymous class syntax update for return object fixture.
tests/TestsSerialization.php	Anonymous class syntax updates for context serializer and context fixtures.
tests/Integration/Schema/Directives/MorphToManyDirectiveTest.php	PHPUnit assertion style normalization.
tests/Integration/Schema/Directives/HasManyDirectiveTest.php	Adds the moved @hasMany integration tests and necessary imports.
tests/Integration/Schema/Directives/AggregateDirectiveTest.php	PHPUnit assertion style normalization inside static factory callback.
tests/Integration/Execution/DataLoader/PaginatedRelationLoaderTest.php	PHPUnit assertion style normalization for loaded model assertions.
src/LighthouseServiceProvider.php	Anonymous class syntax update for default subscription resolver binding.

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