removing leading and trailing spaces from groups in lists

[nitrosx]

Description

This PR removes leading and trailing spaces from the groups listed in ADMIN_GROUPS, DELETE_GROUPS and CREATE_DATASET_GROUP.

Motivation

This PR is motivated from the fact that many administrators would add spaces between commas and group names, so the lists are more understandable. This would result in a group name with a leading and/or trailing space, which caused confusion as the user would not see the difference

Changes:

• src/config/configuration.ts: added trim function when extracting the groups from lists
• src/casl/casl-ability.factory.ts

Tests included/Docs Updated?

• Included for each change/fix?
• Passing? (Merge will not be approved unless this is checked)
• Docs updated?
• New packages used/requires npm install?
• Toggle added for new features?