Resolve #3373065 "Fix the issues"

Closes #3373065

added 8 commits

• 44d76fd5 - Issue #3405521 by dj1999, lexhouk: Undefined array key "severity" in exception_mailer_mail()
• 9d814663 - Avoid Error: Call to a member function getPreferredLangcode() on bool.
• a405af85 - Issue #3395572 by lexhouk, szato: Queue workers are broken
• 6452e9e7 - Issue #3414245 by szato: TranslatableMarkup trigger InvalidArgumentException:...
• 2d5a961a - Issue #3372927 by sidharth_soman: Permission property in the routing file
• 2ee64e0d - Issue #3373065 by pragati_kanade, szato: Fix the issues reported by phpcs
• 8ebd95d0 - Avoid infinite loops, fix phpcs and deprecated code.
• 190c279f - Fixed the coding standards.

Compare with previous version

changed target branch from 8.x-3.x to 4.0.x

We need to translate these strings.