Added coverage for ChangeContentSource action on hosts

[LadislavVasina1]

In this PR I have added coverage for the Change Content Source option that is available to run on the hosts.
I have also fixed some broken locators in the job_invocation file and also extended it for some useful entities.

This PR is necessary for Robottelo#14004.

[lhellebr]

@LadislavVasina1 This PR broke JobInvocationEntity view.fill action:

wait_for.TimedOutError: Could not do 'function _click()' at /home/lhellebr/git/robottelo/venv/lib64/python3.11/site-packages/widgetastic_patternfly4/dropdown.py:71 in time

That's because the locator of job_template has changed. Specifically, it changed from the field to a mere button. Please, can you make it work again, using the correct data-ouia-component-id?

[LadislavVasina1]

@LadislavVasina1 This PR broke JobInvocationEntity view.fill action:

wait_for.TimedOutError: Could not do 'function _click()' at /home/lhellebr/git/robottelo/venv/lib64/python3.11/site-packages/widgetastic_patternfly4/dropdown.py:71 in time

That's because the locator of job_template has changed. Specifically, it changed from the field to a mere button. Please, can you make it work again, using the correct data-ouia-component-id?

Should be fixed by this #1263