Corrected scheduling to wait for more files to be queued before creating ArchiveForRepack mount + Unit test

Corrected auto garbage collection of ArchiveRequest ToTransferForRepack (getQueueType missed one case)

Changed catch(std::out_of_range) to catch(std::out_of_range &) in order to avoid the following type of compilation error:

../CTA/common/checksum/ChecksumBlob.hpp:145:18: error: catching polymorphic type ‘class std::out_of_range’ by value [-Werror=catch-value=]
     } catch(std::out_of_range) {
                  ^~~~~~~~~~~~
cc1plus: all warnings being treated as errors

Increased the time to lock a Rados object from 300ms to 1 sec. This correction is due to CI repack error (caused by BackendRados::lockBackoff(): timeout)

Removed objectstore initialization agent after objectstore initialization (cta-objectstore-initialize.cpp)
Catched other exceptions in continuousintegration/orchestration/tests/client-ar-abortPrepare.cpp

Should be archiving a different file for every xrdcp. Need to add some comments as it starts to be really really bad...

Resolve "Handle the ABORT_PREPARE workflow event in CTA" and #533

Closes #533 and #252

See merge request cta/CTA!7

Master merging master into 252-533-merge before doing the oposite.

See merge request cta/CTA!6