Move test-admin.php and test-core.php from tests/ to tests/phpunit/
to match phpunit.xml configuration which only scans tests/phpunit/.
This fixes PHPUnit test discovery issues where tests were being
skipped because they were in the wrong directory.
All test files now in: tests/phpunit/
- test-admin.php
- test-core.php
- test-multisite.php
- bootstrap.php
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