Fix CodePolicy violations from OTOBO::Perl::ObjectDependencies;

[bschmalhofer]

There are still some violations from OTOBO::Perl::ObjectDependencies;

[checked] Kernel/System/MigrateFromOTRS/CloneDB/Backend.pm
�[33mTidyAll::Plugin::OTOBO::Perl::ObjectDependencies�[0m
�[31mThe following objects are used in the code, but not declared as dependencies:
    'Kernel::Language',
�[0m

Originally posted by @bschmalhofer in #760 (comment)

[bschmalhofer]

Unittests look fine, only the usual Selenium errors.
Now down to 15 violations and 194 tidied files in the OTOBO repository.
Closing this issue.