Revert eviction test to original behaviour and retry failed requests

UPDATE: After taking a look at the code of the eviction test there was a misunderstanding of xargs flags usage, so for now we will just revert to the original behaviour and see if this improves the situation. For further details see: #662 (closed)

Original Title: Retry failed evict requests in system tests for 'Resource temporarily unavailable' errors

Problem to solve

One of the main causes for client system tests failing lately is that some files not being evicted due to the following errors:

MGM

240402 13:54:14 ERROR [12001/01200]       poweruser1 ::triggerPrepareWorkflow Unable to prepare - synchronous prepare workflow error /eos/ctaeos/preprod/1cf1bf0a-9bc5-4aa5-a7f8-41ec31f370a8/0/04359; Unable to trigger workflow - synchronous workflow failed /eos/ctaeos/preprod/1cf1bf0a-9bc5-4aa5-a7f8-41ec31f370a8/0/04359; Resource temporarily unavailable 

WFE

240402 13:54:14 INFO  WFE:1620                       default SYNC::EVICT_PREPARE /eos/ctaeos/preprod/1cf1bf0a-9bc5-4aa5-a7f8-41ec31f370a8/0/04359 ctafrontend:10955 fxid=0000111d mgm.reqid="*" 
240402 13:54:14 INFO  WFE:2182                       fxid=111d file=/eos/ctaeos/preprod/1cf1bf0a-9bc5-4aa5-a7f8-41ec31f370a8/0/04359 msg="Failed to issue evict for evict_prepare event"

Proposal

Track the failed requests and retry those that matched the error one second after all the requests have been submitted.