Fix phpcs issues

FILE: ...s/custom/taxonomy_manager/src/Tests/TaxonomyManagerPagesTest.php
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FOUND 2 ERRORS AFFECTING 2 LINES
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 15 | ERROR | Missing member variable doc comment
 16 | ERROR | Missing member variable doc comment
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FILE: .../custom/taxonomy_manager/src/Tests/TaxonomyManagerConfigTest.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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 34 | WARNING | t() calls should be avoided in classes, use
    |         | \Drupal\Core\StringTranslation\StringTranslationTrait
    |         | and $this->t() instead
 36 | WARNING | t() calls should be avoided in classes, use
    |         | \Drupal\Core\StringTranslation\StringTranslationTrait
    |         | and $this->t() instead
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FILE: ...modules/custom/taxonomy_manager/src/Form/TaxonomyManagerForm.php
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FOUND 3 ERRORS AND 9 WARNINGS AFFECTING 11 LINES
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  98 | ERROR   | [x] No space found before comment text; expected "//
     |         |     &&" but found "//&&"
  98 | ERROR   | [x] Comments may not appear after statements
  99 | ERROR   | [x] No space found before comment text; expected "//
     |         |     ($this->config('advagg_mod.settings')->get('js_adjust_sort_external'))"
     |         |     but found
     |         |     "//($this->config('advagg_mod.settings')->get('js_adjust_sort_external'))"
 102 | WARNING | [x] A comma should follow the last multiline array
     |         |     item. Found: )
 114 | WARNING | [ ] \Drupal calls should be avoided in classes, use
     |         |     dependency injection instead
 176 | WARNING | [ ] \Drupal calls should be avoided in classes, use
     |         |     dependency injection instead
 201 | WARNING | [ ] Unused variable $selected_terms.
 236 | WARNING | [ ] \Drupal calls should be avoided in classes, use
     |         |     dependency injection instead
 238 | WARNING | [ ] \Drupal calls should be avoided in classes, use
     |         |     dependency injection instead
 253 | WARNING | [ ] \Drupal calls should be avoided in classes, use
     |         |     dependency injection instead
 261 | WARNING | [x] A comma should follow the last multiline array
     |         |     item. Found: $current_path
 299 | WARNING | [ ] \Drupal calls should be avoided in classes, use
     |         |     dependency injection instead
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PHPCBF CAN FIX THE 5 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...tml/modules/custom/taxonomy_manager/src/Form/DeleteTermsForm.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 8 | WARNING | [x] Unused use statement
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: .../html/modules/custom/taxonomy_manager/src/Form/MoveTermsForm.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 8 | WARNING | [x] Unused use statement
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...es/custom/taxonomy_manager/src/Form/AddTermsToVocabularyForm.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 8 | WARNING | [x] Unused use statement
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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