[SIGMON-526] change pm_timestamps to timestamps

Simon Mazenouxrequested to merge
SIGMON-526_add_check_for_pic into dev

Just a quick fix, the main changes were already merged in the lhc-sm-api repo.

Context:

Another timestamp was added to the PIC2 analysis, but unlike the other ones which are queried from PM, this one is queried from NXCALS. Therefore, the variable name pm_timestamps needed to be renamed to a more generic timestamps

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