for #19039 and #19041 this:
- fixes the install/remove scripts to read the env variable the proper
way
- truncates output before storing in the databse in case its longer than
MySQL's TEXT size
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
<!-- Note that API documentation changes are now addressed by the
product design team. -->
- [x] Added/updated tests
- [x] Manual QA for all new/changed functionality
for https://github.com/fleetdm/fleet/issues/19020
- Fixes the rollback logic to get the right script for the software
being installed
- Fixes the messages displayed in the install results
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
<!-- Note that API documentation changes are now addressed by the
product design team. -->
- [x] Added/updated tests
- [x] Manual QA for all new/changed functionality
Feature cleanup
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
<!-- Note that API documentation changes are now addressed by the
product design team. -->
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://fleetdm.com/docs/contributing/committing-changes#changes-files)
for more information.
- [x] Manual QA for all new/changed functionality
