Fix the issues reported by phpcs

All issues fixed except for the 'line exceeds 80 characters' errors. I'm leaving those as it is due to readability purposes.

Hi I have reviewed the MR and it resolve the issue but there are still some issue remains.
Moving this to Need Work for get it done.

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

FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/group_content_menu/group_content_menu.post_update.php
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FOUND 2 ERRORS AFFECTING 2 LINES
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49 | ERROR | The array declaration extends to column 121 (the limit is 120). The array content should be split up over multiple lines
76 | ERROR | The array declaration extends to column 122 (the limit is 120). The array content should be split up over multiple lines
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/group_content_menu/tests/src/Functional/GroupContentMenuTest.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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161 | WARNING | Line exceeds 80 characters; contains 82 characters
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/group_content_menu/src/Access/GroupOwnsMenuContentAccessChecker.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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77 | WARNING | Line exceeds 80 characters; contains 83 characters
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Time: 881ms; Memory: 14MB

Issue summary updated.

Hi,
Applied MR!18 and checked for phpcs errors and warnings.
There are no errors found.