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

use PHP_CodeSniffer\Files\File;

use PHP_CodeSniffer\Sniffs\Sniff;

use PHP_CodeSniffer\Util\Tokens;

/**

 * Ensures hook comments on function are correct.

namespace Drupal\Sniffs\Commenting;

use Drupal\Sniffs\Commenting\FunctionCommentSniff;

use PHP_CodeSniffer\Files\File;

use PHP_CodeSniffer\Sniffs\AbstractVariableSniff;

use PHP_CodeSniffer\Util\Tokens;

/**

 * Parses and verifies class property doc comments.

namespace Drupal\Sniffs\Formatting;

use PHP_CodeSniffer\Files\File;

use PHP_CodeSniffer\Standards\Generic\Sniffs\Formatting\MultipleStatementAlignmentSniff as GenericMultipleStatementAlignmentSniff;

use PHP_CodeSniffer\Util\Tokens;

namespace Drupal\Sniffs\InfoFiles;

use Drupal\Sniffs\InfoFiles\ClassFilesSniff;

use PHP_CodeSniffer\Files\File;

use PHP_CodeSniffer\Sniffs\Sniff;

namespace Drupal\Sniffs\InfoFiles;

use Drupal\Sniffs\InfoFiles\ClassFilesSniff;

use PHP_CodeSniffer\Files\File;

use PHP_CodeSniffer\Sniffs\Sniff;