Elimininate the calls to utf8::upgrade()

[bschmalhofer]

Throughout the code base there are some calls to utf8::upgrade(). These are perfectly fine as we want Perl strings with internal UTF-8 encoding. However most of these upgrade strings that come from Kernel::System::YAML::Dump(). That method already upgrades the generated YAML strings. So I propose to remove the redundant calls. Especially as I fear that utf8::upgrade() is not employed consistently. The utf8::upgrade()in Kernel::System::YAML must of course stay intact.

$ grep -rl utf8::upgrade Kernel/System/
Kernel/System/ACL/DB/ACL.pm
Kernel/System/.YAML.pm.swp
Kernel/System/DynamicField.pm
Kernel/System/ProcessManagement/DB/ActivityDialog.pm
Kernel/System/ProcessManagement/DB/Transition.pm
Kernel/System/ProcessManagement/DB/TransitionAction.pm
Kernel/System/ProcessManagement/DB/Process.pm
Kernel/System/ProcessManagement/DB/Activity.pm
Kernel/System/YAML.pm

[bschmalhofer]

PR is merged. The test suite will be run later. Closing this issue.