Chore: Set environment variables for farm

[iLLiCiTiT]

Changelog Description

Moved some of logic to define farm job environment variables from ayon-deadline to ayon-core.

Additional info

There already is plugin https://github.com/ynput/ayon-deadline/blob/develop/client/ayon_deadline/plugins/publish/global/collect_deadline_job_env_vars.py that is collecting environment variables, but that is not extedable because the constant defined in deadline should be supplied from ayon core, and most of the variables defined in the plugin should be defined by ayon-core, ayon-ftrack, ayon-shotgrid or ayon-applications addon. This is first step to be able to actually do it in the other plugins. Right now they would have to import from ayon-deadline and have dependency to ayon-deadline addon.

This PR also will take effect only with changes in this PR ynput/ayon-deadline#67

Future steps

• Remove those env variables from ayon-deadline.
• Use constant FARM_JOB_ENV_DATA_KEY defined in ayon core instead of constant defined in ayon deadline.
• Move remaining env variables to corresponding repositories (ftrack > ftrack addon, shotgrid > shotgrid addon, applications > applications addon.

Testing notes:

1. With this PR Chore: Don't override already set env variables ayon-deadline#67 the environment variables should be set by ayon-core.

[BigRoy]

Looks good to me - with the exception of the comments as potential follow ups.

[BigRoy]

I know it's technically not related to this PR - but why do we need to pass the workdir? Isn't this workdir path also local to the current machine and not rootless? I have a feeling we should maybe, after this PR investigate this and potentially clean that up?

[BigRoy]

It may be used here by the way:

• ayon-core/client/ayon_core/plugins/publish/collect_rendered_files.py

  Lines 176 to 187 in a08a1af

  	# Remap workdir if it's set
  	workdir = os.getenv("AYON_WORKDIR")
  	remapped_workdir = None
  	if workdir:
  	remapped_workdir = anatomy.roots_obj.path_remapper(
  	os.getenv("AYON_WORKDIR")
  	)
  	if remapped_workdir:
  	os.environ["AYON_WORKDIR"] = remapped_workdir
  	except Exception as e:
  	self.log.error(e, exc_info=True)
  	raise Exception("Error") from e

But I guess that should still be set by the "launch context" regardless?

[iLLiCiTiT]

I did try to find out where it is used, and I didn't find anything. If you can create issue it would be nice.

[iLLiCiTiT]

It may be used here by the way:

Yes, but is it then used for anything?