Fix the issues reported by phpcs

Problem/Motivation

Coding standards issue found by phpcs.

FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/multi_region/src/Form/ConfigurableRegionForm.php
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FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
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10 | WARNING | The class short comment should describe what the class does and not simply repeat the class name
41 | 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
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/multi_region/src/Plugin/Block/RegionLanguageSwitcherBlock.php
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FOUND 1 ERROR AFFECTING 1 LINE
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6 | ERROR | [x] Use statements should be sorted alphabetically. The first wrong one is Drupal\Core\Access\AccessResult.
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/multi_region/src/ConfigurableRegionHtmlRouteProvider.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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19 | WARNING | Possible useless method overriding detected
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/multi_region/src/ConfigurableRegionAccessControlHandler.php
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FOUND 1 ERROR AFFECTING 1 LINE
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8 | ERROR | [x] Use statements should be sorted alphabetically. The first wrong one is Drupal\Core\Access\AccessResult.
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/multi_region/src/ConfigurableRegionListBuilder.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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7 | WARNING | [x] Unused use statement
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/multi_region/src/RegionManager.php
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FOUND 1 ERROR AND 3 WARNINGS AFFECTING 4 LINES
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5 | WARNING | [x] Unused use statement
8 | WARNING | [x] Unused use statement
129 | ERROR | [x] Object operator not indented correctly; expected 8 spaces but found 10
139 | WARNING | [ ] \Drupal calls should be avoided in classes, use dependency injection instead
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PHPCBF CAN FIX THE 3 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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Steps to reproduce

Use the below command with arguments:-
phpcs --standard=Drupal,DrupalPractice --extensions=php,module,inc,install,test,profile,theme,info,txt,md,css,js,yml web/modules/custom/multi_region

Proposed resolution

Fix the phpcs issue found.