fix: preserve the global afterAll hook until class teardown

[lazerg]

What:

• Bug Fix

Description:

A global afterAll() hook (registered via uses()/pest()) never runs, while beforeAll, beforeEach and afterEach work. beforeAll is consumed in setUpBeforeClass before any test runs, but the last test's tearDown flushes the static $__afterAll before tearDownAfterClass reads it, so the global afterAll silently no-ops. This captures the hook in setUpBeforeClass while it's still set and uses that copy at teardown.

Related:

Closes #1694

[lazerg]

@nunomaduro bumping this — a couple of people have hit the same afterAll issue in the thread.