Publishing renders without AOV in names adds underscore to subset name

[antirotor]

Problem

When publishing renders from Deadline there is an issue when AOV name is empty, It will create subset name with underscore at the end. This mainly concerns beauty renders and will results in names like renderLightingMain_,

This is cause of it:

https://github.com/pypeclub/OpenPype/blob/806c6d2daf137d1d592e22d761703c1ed27363d6/openpype/modules/default_modules/deadline/plugins/publish/submit_publish_job.py#L421-L424

When AOV is empty, it will just adds underscore.

Now the question is how to deal with it in backwards compatible manner - in running projects, there can be already lot of published subsets with underscore at the end. If fixed directly it will produce another subset.

[cuID:OP-2622]