[receiver/filelog] Can we safely update filepath when rotation is detected.

[djaglowski]

          > I was confused because the debug logs would always show the original log name, I had thought it might change to the rotated name, that was a bad assumption.

Seems like a reasonable assumption to me and something we could likely fix.

Originally posted by @djaglowski in https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/35777#issuecomment-2455701852

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