Fix 'EOS command 'evict'/'stagerrm' not deleting files on FST'

As shown in https://gitlab.cern.ch/cta/operations/-/issues/1211#note_7218878, the EOS command evict/stagerrm was no longer deleting the files on the FST, due to a misuse of the flag forceRemove on XrdMgmOfs::_dropallstripes(...) and XrdMgmOfs::_dropstripe(...):

• https://gitlab.cern.ch/dss/eos/-/blob/5.1.29/mgm/XrdMgmOfs/Stripes.cc?ref_type=tags#L321

This merge request fixes that.

It also fixes a related bug on the attribute linking for CTA workflow.

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Corresponding EOS Jira ticket:

• https://its.cern.ch/jira/browse/EOS-5937