Use Magento's PHP 8 Attributes in Tests Instead of Annotations

[JosephLeedy]

Replace usages of Magento's annotations in tests with new PHP 8 attributes.

Old Annotation	New Attribute
@magentoAppIsolation enabled	#[\Magento\TestFramework\Fixture\AppIsolation(true)]
@magentoAppArea frontend	#[\Magento\TestFramework\Fixture\AppArea('frontend')]
@magentoConfigFixture current_store sales/custom_order_fees/custom_fees []	#[\Magento\TestFramework\Fixture\Config(ConfigInterface::CONFIG_PATH_CUSTOM_FEES, '[]', ScopeInterface::SCOPE_STORE, 'current')]
@magentoDataFixture JosephLeedy_CustomFees::../test/Integration/_files/orders_with_custom_fees.php	#[\Magento\TestFramework\Fixture\Data('JosephLeedy_CustomFees::../test/Integration/_files/orders_with_custom_fees.php')

[JosephLeedy]

Support for test attributes was added in Magento 2.4.5, so after making this change, tests will no longer pass on 2.4.4. I'm fine with this limitation as I plan to drop support for 2.4.4 after the new Magento patches are released in June. ("p13" is the final patch for the 2.4.4 line and was released on April 12, 2025.)