As a Spack maintainer I want to remove the spack bootstrap command (outdated since #14062) so that I could reduce the amount of boilerplate code in the project.

Rationale

The spack bootstrap command was used to "Bootstrap packages needed for spack to run smoothly" and in reality it has always just installed environment-modules~X. Since #14062 shell integration doesn't require environment-modules anymore making the command outdated. I would therefore remove that command from the code base.

Description

Just remove the command and any test / package associated only with it.

Additional information

Opening the issue to check what is the consensus towards this.