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Fix SIGCHILD handling loop

Problem

By looking to the CI logs in #1029 (comment 8967705), I noticed that the SIGCHILD signal is being handled many times by the parent process, in a loop, without being properly reset.

This seems to happen because m_processingStatus.sigChild is not cleared unless the SignalHandler sub-process handler receives a new signal. It should probably be cleared in SignalHandler::processSigChild() instead of waiting for the next signal.

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{"epoch_time":1737621772.278920637,"local_time":"2025-01-23T09:42:52+0100","hostname":"cta-tpsrv02-0","program":"cta-taped","log_level":"INFO","pid":443,"tid":443,"message":"Propagated SIGCHILD.","drive_name":"VDSTK02","instance":"CI","sched_backend":"ceph","SubprocessName":"maintenanceHandler"}
{"epoch_time":1737621772.279001107,"local_time":"2025-01-23T09:42:52+0100","hostname":"cta-tpsrv02-0","program":"cta-taped","log_level":"INFO","pid":443,"tid":443,"message":"Handler received SIGCHILD. Propagating to all handlers.","drive_name":"VDSTK02","instance":"CI","sched_backend":"ceph","SubprocessName":"signalHandler"}
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