style(use statements): Remove unused use statements and enable check in phpcs config

coder_sniffer/Drupal/Sniffs/Commenting/HookCommentSniff.php

...sniffer/Drupal/Sniffs/Commenting/VariableCommentSniff.php

...pal/Sniffs/Formatting/MultipleStatementAlignmentSniff.php

coder_sniffer/Drupal/Sniffs/InfoFiles/AutoAddedKeysSniff.php

coder_sniffer/Drupal/Sniffs/InfoFiles/RequiredSniff.php

coder_sniffer/Drupal/Sniffs/Semantics/ConstantNameSniff.php

coder_sniffer/Drupal/Sniffs/Semantics/EmptyInstallSniff.php

coder_sniffer/Drupal/Sniffs/Semantics/FunctionAliasSniff.php

...sniffer/Drupal/Sniffs/Semantics/FunctionWatchdogSniff.php

coder_sniffer/Drupal/Sniffs/Semantics/InstallHooksSniff.php

...ffer/Drupal/Sniffs/Semantics/LStringTranslatableSniff.php

coder_sniffer/Drupal/Sniffs/Semantics/PregSecuritySniff.php

coder_sniffer/Drupal/Sniffs/Semantics/TInHookSchemaSniff.php

coder_sniffer/Drupal/Test/CoderSniffUnitTest.php

...fer/DrupalPractice/Sniffs/Objects/GlobalFunctionSniff.php

phpcs.xml.dist