\Drupal calls should be avoided in classes, use dependency injection instead

I have implemented the DI. Please review.

Provided patch in #2 get applied cleanly but there are still some error found
Providing updated patch

./vendor/bin/phpcs --standard=Drupal,DrupalPractice --extensions=php,module,inc,install,test,profile,theme,info,txt,md,css,js,yml web/modules/custom/gcontent_moderation

FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/gcontent_moderation/tests/modules/gcontent_moderation_test/src/GroupStateTransitionValidation.php
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FOUND 6 ERRORS AFFECTING 6 LINES
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12 | ERROR | [x] Use statements should be sorted alphabetically. The first wrong one is Drupal\Core\Entity\EntityTypeManagerInterface.
33 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
34 | ERROR | [x] Expected 5 space(s) before asterisk; 3 found
35 | ERROR | [x] Expected 5 space(s) before asterisk; 3 found
36 | ERROR | [x] Expected 5 space(s) before asterisk; 3 found
37 | ERROR | [x] Expected 5 space(s) before asterisk; 3 found
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PHPCBF CAN FIX THE 6 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/gcontent_moderation/tests/src/Functional/ContentModerationIntegrationTest.php
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FOUND 1 ERROR AND 4 WARNINGS AFFECTING 5 LINES
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151 | ERROR | The array declaration extends to column 86 (the limit is 80). The array content should be split up over multiple lines
173 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
188 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
190 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
204 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
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Time: 346ms; Memory: 12MB