chore: add more info to an failure of activation

[ruben-arts]

No description provided.

[ruben-arts]

@baszalmstra What do you think? Should we do something like this or improve the error in rattler?

[daenny]

This is awesome!

Previous output was:

❯ pixi shell -v
 INFO pixi::lock_file::update: the lock-file is up-to-date
  × Failed to run activation script (status: exit status: 1)

afterwards:

❯ pixi shell -v
INFO pixi::lock_file::update: the lock-file is up-to-date
× Failed to run activation script (status: exit status: 1)
  × Failed to run activation script for Default. Status: exit status: 1. Stdout: SHELL=/bin/bash
│ ROS_VERSION=1
│ SESSION_MANAGER=local/pop-os:@/tmp/.ICE-unix/3165,unix/pop-os:/tmp/.ICE-unix/3165
│ QT_ACCESSIBILITY=1
│ COLORTERM=truecolor
[...] snip
│ . Stderr: Error [sr_logging]: At least one of these two environment variables must be set: 'CONDA_ENV_PATH' or 'PREFIX'. Script: /usr/bin/env
[...] snip

Showing me exactly where to look for my issue!