Issue #3586893: Fix PathAliasNormalizer nullable constructor args

Closes #3586893

Updates PathAliasNormalizer's constructor so the required EntityRepositoryInterface dependency is passed before the optional EntityTypeRepositoryInterface and EntityFieldManagerInterface dependencies. Those optional dependencies are now explicitly nullable, and the service arguments are reordered to match.

Checked locally: composer validate --no-check-publish; php -l modules/tome_sync/src/Normalizer/PathAliasNormalizer.php; git diff --check.

Credit to mr.white for the original patch.