MDEV-27037 mysqlbinlog emits a warning when reaching EOF before stop-condition

[DaveGosselin-MariaDB]

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Emit warnings if finished processing input files before reaching the boundary conditions indicated by either --stop-position or --stop-datetime.

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[DaveGosselin-MariaDB]

I need to investigate why some of the builders failed on my new test for the second commit while others did not.