add support for prepare_cmds in the EESSI environments

[smoors]

in the config file, EESSI prepare_cmds really belong in the environments instead of the partitions, because otherwise it would mess up the local environment.

to help with this, i added the eessi_prepare_cmds argument to set_required_config. now i can change in the config file this:

set_common_required_config(site_configuration)

for environ in site_configuration['environments']:
    if environ['name'].startswith('EESSI'):
        environ['prepare_cmds'] = ['export MODULEPATH=/cvmfs/software.eessi.io/init/modules']

to this:

eessi_prepare_cmds = ['export MODULEPATH=/cvmfs/software.eessi.io/init/modules']
set_common_required_config(site_configuration, set_memory=False, eessi_prepare_cmds=eessi_prepare_cmds)                                                                                                                                                                               

see also the companion docs PR EESSI/docs#862

[smoors]

i removed this because the scorecards checks are not designed for running on every PR. it will still run every week on the main branch.

[laraPPr]

@smoors I noticed that what I did is indeed not working. But this would also not work at UGent. Because it still requires the module --force purge

[laraPPr]

Is this not better?

Suggested change

	'source /cvmfs/software.eessi.io/2025.06/init/lmod/bash',
	'module unload EESSI',
	'module use /cvmfs/software.eessi.io/init/modules',

[laraPPr]

lgtm