[pkg/stanza] Fix collector stops reading new file after copytruncate rotation #46075

Job	Run time
setup-environment	3m 43s
arm-unittest-matrix (receiver-1)	8m 7s
arm-unittest-matrix (receiver-0)	6m 25s
arm-unittest-matrix (receiver-2)	10m 16s
arm-unittest-matrix (receiver-3)	7m 1s
arm-unittest-matrix (processor-0)	3m 25s
arm-unittest-matrix (processor-1)	5m 53s
arm-unittest-matrix (exporter-2)	4m 0s
arm-unittest-matrix (exporter-1)	9m 55s
arm-unittest-matrix (cmd-0)	2m 34s
arm-unittest-matrix (pkg)	5m 23s
arm-unittest-matrix (exporter-0)	3m 21s
arm-unittest-matrix (connector)	5m 12s
arm-unittest-matrix (exporter-3)	5m 2s
arm-unittest-matrix (internal)	8m 38s
arm-unittest-matrix (extension)	7m 31s
arm-unittest-matrix (other)	5m 25s
arm-unittest	4s
flakytests-generate-issues	0s
	1h 41m 55s

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