[12.x] Run Mockery cleanup via PHPUnit subscriber instead of explicit m::close() calls

[lucasmichot]

Summary

This PR centralizes Mockery cleanup by registering a PHPUnit event subscriber that calls Mockery::close() after each test method.

As a result:

• Explicit m::close() calls are removed from individual tests
• Mockery is consistently referenced via the m alias
• Cleanup is guaranteed even when tests exit early or throw

Motivation

Historically, many tests relied on manually calling m::close() in tearDown() or inline within test cases. This approach is:

• Easy to forget
• Inconsistent across the test suite
• Fragile when tests fail early

By moving cleanup to a PHPUnit subscriber, Mockery teardown becomes automatic, global, and uniform.

What changed

• Added a PHPUnit runner extension that registers an AfterTestMethodFinished subscriber
• The subscriber calls Mockery::close() after every test
• Removed redundant m::close() calls from tests
• Standardized Mockery usage to the m alias throughout the suite

Benefits

• Eliminates an entire class of test hygiene issues
• Reduces boilerplate in tests
• Ensures deterministic Mockery cleanup
• Aligns with PHPUnit ≥10 event-based architecture

Notes

• The subscriber runs once per test method
• This change does not alter test behavior, only cleanup mechanics
• Compatible with PHPUnit 10+

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