Move render_specific_not_found to SharedHelpers

[perlpunk]

Issues:

• https://progress.opensuse.org/issues/163931
• https://progress.opensuse.org/issues/163592
• https://progress.opensuse.org/issues/163757

Prevents:

Can't locate object method "render_specific_not_found" via package "OpenQA::Shared::Controller::Running"

I'm not sure how to test this. The t/26-controllerrunning.t is mocking that function.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.43%. Comparing base (4ad2e08) to head (36b3ad8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5762 +/- ## ======================================= Coverage 98.43% 98.43% ======================================= Files 393 393 Lines 38615 38615 ======================================= Hits 38012 38012 Misses 603 603 ```

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