[SPARK-51918][CORE] Executor exit wait for out/err appenders to stop + flush remaining data #50715
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What changes were proposed in this pull request?
Fix executor exit routine to wait for stdout/stderr appenders to stop and flush remaining data.
Why are the changes needed?
Spark application logs are cutoff on executor exit.
Does this PR introduce any user-facing change?
No
How was this patch tested?
manually
Was this patch authored or co-authored using generative AI tooling?
No