[6.13.z] Changing inputs as a optional parameter in job-invocation

[Satellite-QE]

Cherrypick of PR: #866

Apidoc snippet:

job_invocation[inputs]optional , nil allowed | Inputs to useValidations:Hash

Usage:

job = entities.JobInvocation().run(
            data={
                'job_template_id': 89,
                'inputs': {'command': 'ls'},
                'targeting_type': 'static_query',
                'search_query': f'name = {rhel7_contenthost.hostname}',
            }
        )

I came across this when I was trying to invoke an ansible job on a host, which raises an key error for not having an input.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (6.13.z@7d37479). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
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  Hits              ?     2720           
  Misses            ?      178           
  Partials          ?        0           

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