fix(afs_group): fixed group name resolving

Description

fix(afs_group): fixed group name resolving

• Use only basename of the files/path to determine group name.

How to test

not relevant

Author's checklist

• I have followed the contribution guidelines
• This MR has been tested or does not change functionality
• I have added relevant merge request dependencies (if this MR has any)
• I have added the correct labels
• I have assigned reviewers (if any are relevant)
• I have edited the documentation (if the changes require it) or I have noted the need for the change if I do not have access to the documentation
• I have marked all introduced BREAKING CHANGES or necessary DEPLOYMENT NOTES in the commit message(s)

Reviewer's checklist

• This MR has been tested or does not change functionality
• This MR has correct commit message format

Other information

Former implementation with backticks returned different output, so for new implementation we must use only basename of the returned file to determine correct group name.

Related issues

none