fix: graceful shutdown should wait until the event worker has finished all its work

[nyannyacha]

What kind of change does this PR introduce?

Bug fix

Description

Fixes an issue where the graceful shutdown terminates the process even though the event worker has unprocessed log entries.

List of flag to be created due to the introduction of this PR

• --event-worker-exit-timeout flag specifies the maximum time in seconds that can wait for the event worker before terminating forcibly. (This flag is only valid in the context of graceful shutdown.)

[github-actions[bot]]

:tada: This PR is included in version 1.58.13 :tada:

The release is available on GitHub release

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