refs #373980 remove button after autocomplete

Remove mechanism which "expand" autocomplete to old fashion select tag.

Important changes only in devel and redmine_extensions_gem. Other reps just for clean up old code.

Related MR:

• https://git.easy.cz/devel/devel/-/merge_requests/137932
• https://git.easy.cz/devel/easy_scheduler/-/merge_requests/3408
• https://git.easy.cz/devel/modification_easysoftware/-/merge_requests/671
• https://git.easy.cz/platform-2.0/features/easy_jenkins/-/merge_requests/16
• https://git.easy.cz/rysy/features/easy_risk_management/-/merge_requests/199
• https://git.easy.cz/rysy/features/email_field_autocomplete/-/merge_requests/13
• https://git.easy.cz/platform-2.0/features/pohoda_import/-/merge_requests/33