[pkg/stanza] fix recombine operator timeout issue (#20451)

[yutingcaicyt]

When using recombine operator, the behavior is different with description for force_flush_period. Fixing the issue that the actual timeout is much longer than force_flush_period.

In order to make the actual timeout closer to "force_flush_period", set the period of ticker to 1/5 "force_flush_period", so that the entries will be forced to be sent after waiting for at most 6/5 "force_flush_period"

Description:

Link to tracking Issue:
Fixes #20451

Testing:

Documentation:

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[djaglowski]

Thanks for fixing this @yutingcaicyt!