Validate Deadline Connection is missing Unreal

[antirotor]

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Description

Current Behavior

Validate Deadline Connection is missing unreal in host list so it is skipped there. Other Deadline plugins works (like Validate Deadline Pools) - see #158 - works though forcing them to error when Deadline connection isn't available.

Expected Behavior

Dependency on the host attribute of plugins is cumbersome because whenever we add new host supporting Deadline, we need to add it to all places. In this particular case when unreal is missing and just few of the plugins runs it can cause some confusion.

Steps To Reproduce:

Publish render on farm using Unreal without Deadline Webservice running (or blocked)

Additional context:

Version

ayon-deadline 0.5.8+dev

What platform were you running when you found the bug?

Windows

Relevant log output: