Deactivate script is deprecated and not available on mamba environments

[djhoese]

Checklist

• I added a descriptive title
• I searched open reports and couldn't find a duplicate

What happened?

The bin/deactivate script created in conda environments is deprecated:

https://github.com/conda/conda/blob/9a9610fbaf436b7eef4b13559afb756b1b60d047/conda/shell/bin/deactivate#L3

This file is looked for as part of the activation script of conda-pack:

conda-pack/conda_pack/scripts/posix/activate

Lines 35 to 47 in 08e83ca

	# If there's already a source env
	if [ -n "$CONDA_PREFIX" ]; then
	# If the source env differs from this env
	if [ "$CONDA_PREFIX" != "$full_path_env" ]; then
	# Check whether deactivate is a function or executable
	type deactivate >/dev/null 2>/dev/null
	if [ $? -eq 0 ]; then
	. deactivate >/dev/null 2>/dev/null
	fi
	else
	return 0 # nothing to do
	fi
	fi

The mamba tool has already deprecated/not included the deactivate script so the above checks fail. This results in any pre-activated mamba environments not being deactivated during activation of the conda-pack'd environment. In my own tests this resulted in scripts calling the conda-pack'd activate script to just exit and not run anything after activation.

Conda Info

The tarball was created in CI. You can see the build here:

https://github.com/ssec/sift/actions/runs/5086231711/jobs/9140500154

Conda Config

conda-forge

See https://github.com/ssec/sift/actions/runs/5086231711/jobs/9140500154

Conda list

https://github.com/ssec/sift/actions/runs/5086231711/jobs/9140500154

Additional Context

No response