Fix the issues reported by phpcs

Did you left anything in that patch?

Resolved all the PHPCS issues. Please review.

Still missing these errors when running phpcs

FILE: /src/Plugin/GamificationWidgetBase.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 181 | ERROR | Arguments with default values must be at the end of the argument list
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FILE: /src/Plugin/GamificationWidgetManager.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 152 | ERROR | Arguments with default values must be at the end of the argument list
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FILE: /src/GamificationInterface.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 11 | ERROR | Class constants must be uppercase; expected GAMIFICATION but found gamification
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FILE: /src/Form/GamificationForm.php
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FOUND 0 ERRORS AND 6 WARNINGS AFFECTING 6 LINES
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 147 | WARNING | t() calls should be avoided in classes, use
     |         | \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 148 | WARNING | t() calls should be avoided in classes, use
     |         | \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 175 | WARNING | t() calls should be avoided in classes, use
     |         | \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 177 | WARNING | t() calls should be avoided in classes, use
     |         | \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 191 | WARNING | t() calls should be avoided in classes, use
     |         | \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 193 | WARNING | t() calls should be avoided in classes, use
     |         | \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
--------------------------------------------------------------------------------------------------------


FILE: /src/Plugin/GamificationWidgetBase.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
--------------------------------------------------------------------------------------------------------
 183 | WARNING | Unused variable $result.
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I'll combine the patches and check if anything else is missing

I applied the patch from @sourabhjain to the code (which had less phpcs errors remaining) and made the remaining changes consulting @rajeshreeputra patch. Although, there was still two phpcs errors that neither of them addressed (from GamificationInterface.php and GamificationWidgetBase.php), but they were easy to fix.

The patch in #9 applies just fine, and corrects every error and warning pointed by PHPCS before the patch was applied.

The issue summary should always describe what the issue is trying to fix and, in the case, of coding standards issues, report which command has been used, which arguments have been used, and which report that command shown.

The status is also for the issue summary, which needs to be updated.