Cleanup jobs for LangEng extensions

* CLDR: Remove unused job.
* Interwiki: Add phpcs-strict-HEAD job.
* Translate: Remove unused jobs.
* TranslationNotifications: Remove unused jobs.
* TwnMainPage: Remove unused job.
* UniversalLanguageSelector: Remove unused job.

Don't need the full checks for these extensions anymore.
Change-Id: I22fe6ddf3dd76840e9fbbfd72962878f7ce5a1c4