QE: replace a JS call with UI interaction

[NamelessOne91]

What does this PR change?

Closes https://github.com/SUSE/spacewalk/issues/14266

Replace the JS call to setScheduleTime() with actual UI interactions.

GUI diff

No difference

• DONE

Documentation

• No documentation needed: only internal and user invisible changes

• DONE

Test coverage

• A step used in a Cucumber test was edited

• DONE

Links

Issue(s): https://github.com/SUSE/spacewalk/issues/14266
Ports(s): Manager 4.3 https://github.com/SUSE/spacewalk/pull/23368

• DONE

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[github-actions]

👋 Hello! Thanks for contributing to our project.
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Happy hacking!
⚠️ You should not merge if acceptance tests fail to pass. ⚠️

[maximenoel8]

It looks good.
I can see in datepicker steps that our way of describing the actions are really different from navigation for example where we are using actions from commonlib.rb.

But for homogeneity we should probably keep doing that.