introduce environment_variable_groups to the vh exec run command

[Kenneth-Schroeder]

I want to make the environment_variable_groups setting accessible from the CLI and from the valohai yaml.
To achieve this, I have created a PR in valohai-yaml as well (valohai-yaml#160).

I could test my changes on valohai-cli and the local linting on valohai-yaml, however, the API endpoint seems to validate with an older valohai-yaml version as well, causing an API validation error for the yaml version.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.18%. Comparing base (02d2801) to head (c0a0146).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #323   +/-   ##
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  Coverage   86.17%   86.18%           
=======================================
  Files         129      129           
  Lines        4607     4610    +3     
  Branches      592      592           
=======================================
+ Hits         3970     3973    +3     
  Misses        446      446           
  Partials      191      191           

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[akx]

Mmm, there's a difference between explicitly passing "environment_variable_groups": [] and not passing it at all to the API.

If you don't pass it at all, the defaults from the project are used; if you explicitly pass an empty list, the defaults are not used.

Eyeballing this, one of those scenarios isn't supported?