Add log param `mountAttempted` to DataTransferSession

Summary

Currently, CTA reports tape sessions status as failed when a DataTransferSession fails before even attempting to mount a tape. If the reason is not a one-off incident, like FST not reachable, we can end with all drives and tapes disabled.

The simplified logic of a DataTransferSession is:

1. Loop until we find a queue to pop some work to do.
2. Before anything else, try to fetch an initial job.
   • 2.1. If 2 succeeds: start all the required threads (this triggers the mount of the tape) until success or until we face some problem.
   • 2.2. If 2 fails: abort the session. (more details in https://gitlab.cern.ch/cta/operations/-/issues/1539)

The 2.2 case will make TAS start disabling tapes and drives without a good reason for it.

The problem relies on the CTA-TAS communication.

Possible solutions

We will add a new field to the logs

1. We could introduce an aborted state along with success and failure, and only set it for aborts of the data transfer session. 2. Classify all these cases as success from the DataTranferSession status point of view.

At present, I do not see a valid use case 1. as we will get ERROR/WARNING depending on the root cause and we can just go for 2.