Add phpstan-baseline.neon to ignore intentional fatal error in test fixture

Gábor Hojtsyrequested to merge
issue/upgrade_status-3534859:3534859-uncommented-string-on into 4.x

tests/modules/upgrade_status_test_fatal/fatal.php intentionally contains a PHP parse error to test upgrade_status parse error handling. When running phpstan directly on the module outside of testing scenarios, this file causes a fatal analysis failure. The baseline suppresses this known error so phpstan can complete analysis of the rest of the module.

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

Related to #3534859

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