[chore][pkg/stanza] Merge roller into fileconsumer.Manager #28451
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Follows #28419
This discards the separate "roller" and implements the same functionality directly in
fileconsumer.Manager
.The motivation for this is to move towards a system of managing files where each file is managed by only one list at a time. This PR retains two overlapping slices of readers (
previousPollFiles
andknownFiles
), but the functionality does not change. #27823 should get us the rest of the way there.