Only string literals should be passed to t() & t() calls should be avoided in classes

Problem/Motivation

FILE: /var/www/html/drupal9.3.0/web/modules/contrib/freelinking/tests/src/Unit/Plugin/Filter/FreelinkingTest.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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133 | WARNING | Only string literals should be passed to t() where possible
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FILE: /var/www/html/drupal9.3.0/web/modules/contrib/freelinking/tests/src/Unit/Plugin/freelinking/NodeTest.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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124 | WARNING | Unused variable $language.
128 | WARNING | Only string literals should be passed to t() where possible
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FILE: /var/www/html/drupal9.3.0/web/modules/contrib/freelinking/tests/src/Unit/Plugin/freelinking/UserTest.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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128 | WARNING | Only string literals should be passed to t() where possible
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FILE: /var/www/html/drupal9.3.0/web/modules/contrib/freelinking/tests/src/Functional/FreelinkingBrowserTestBase.php
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FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
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59 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
60 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
105 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
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FILE: /var/www/html/drupal9.3.0/web/modules/contrib/freelinking/tests/src/Functional/FreelinkingMultilingualTest.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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101 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
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FILE: /var/www/html/drupal9.3.0/web/modules/contrib/freelinking/tests/src/Functional/FreelinkingFilterTest.php
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FOUND 0 ERRORS AND 7 WARNINGS AFFECTING 7 LINES
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30 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
43 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
56 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
62 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
66 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
68 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
70 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
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FILE: /var/www/html/drupal9.3.0/web/modules/contrib/freelinking/tests/src/Functional/NodeTitleBuiltinFailoverTest.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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39 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
45 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
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FILE: /var/www/html/drupal9.3.0/web/modules/contrib/freelinking/modules/freelinking_prepopulate/tests/src/Functional/FreelinkingPrepopulateTest.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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126 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
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FILE: /var/www/html/drupal9.3.0/web/modules/contrib/freelinking/src/Plugin/Filter/Freelinking.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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178 | WARNING | Unused variable $plugin_name.
190 | WARNING | Only string literals should be passed to t() where possible
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FILE: /var/www/html/drupal9.3.0/web/modules/contrib/freelinking/src/FreelinkingManager.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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129 | WARNING | Unused variable $key.
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