Move env_vars_connector.py to utilities file

[daniellepintz]

Proposed refactoring or deprecation

Is this being used or can we remove this?
https://github.com/PyTorchLightning/pytorch-lightning/blob/c33df2639f19d49c5e7520294e3221efe402d684/pytorch_lightning/trainer/connectors/env_vars_connector.py#L21

[awaelchli]

@Borda do you know if it is being used outside of Lightning (we don't have usages inside of Lightning afaik).

[Borda]

@Borda do you know if it is being used outside of Lightning (we don't have usages inside of Lightning afaik).

I a not aware of this one...

[daniellepintz]

Should we go ahead and remove it as part of 1.5 then? cc @tchaton

[tchaton]

Dear @daniellepintz,

I know some users are relying on this to inject dynamically parameters within the Trainer as env variable. Personally, I am in favor of keeping it.