Allow to specify nodeSelector to pod deployed by a (backup) jobs

[sambartik]

Describe the feature you'd like to have.
Allow to specify nodeSelector to pods deployed for a (backup) jobs

What is the value to the end user? (why is it a priority?)
Improves the granularity on which nodes is volsync allowed to run.

How will we know we have a good solution? (acceptance criteria)
A helm chart allows either to specify nodeSelector for job pods or share the preexisting nodeSelector for the volsync operator.

Additional context
Since the current release does not have ARM builds, backing up jobs fail due to them being scheduld on ARM nodes. This would allow volsync to run in mixed clusters.

#828

[tesshuflower]

This PR added the functionality of setting affinity for mover pods - would this give you what you need?

#1340

[sambartik]

Indeed, it does. I was not of that property in a mover config. Thanks for the tip!