refactor(phpstan): Fix PHPStan reports for level 1 (#3104477)

coder_sniffer/Drupal/Sniffs/Commenting/DocCommentSniff.php

...sniffer/Drupal/Sniffs/Commenting/FunctionCommentSniff.php

...r_sniffer/Drupal/Sniffs/Commenting/InlineCommentSniff.php

...fer/Drupal/Sniffs/Semantics/FunctionTriggerErrorSniff.php

...er/Drupal/Sniffs/WhiteSpace/ObjectOperatorIndentSniff.php

coder_sniffer/Drupal/Sniffs/WhiteSpace/ScopeIndentSniff.php

coder_sniffer/Drupal/Test/Semantics/ConstantNameUnitTest.php

coder_sniffer/Drupal/Test/bad/BadUnitTest.php

coder_sniffer/Drupal/Test/good/GoodUnitTest.php

coder_sniffer/DrupalPractice/Test/good/GoodUnitTest.php

phpstan.neon