[receiver/filelog] Retain original file attributes over rotated file attributes

[djaglowski]

However, in the container parser specifically the parser checks the file name when it tries to parse each line and if it fails to match the pattern of known log files then it will reject the log line

I think it's worth exploring whether the original file name can be kept, rather than associating the logs with the rotated file. If we'd been a bit faster to read them, they would be, so it seems odd that this should change depending on marginal timing issues.

I'm going to approve #38440 because it offers an immediate solution to this particular situation and doesn't have much downside (presumably just a minor performance hit on the regex eval). However, I'll open another issue describing the change which would resolve the root cause.

Originally posted by @djaglowski in #35137

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