[BP-2.3][FLINK-40086][runtime] Adds error handling to newly added preCompletionAction

[XComp]

2.3 backport for #28699

[flinkbot]

CI report:

• b5e218e Azure: FAILURE

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[XComp]

@davidradl Thanks for looking into that. It might be better to not merge backports as long as the parent PR isn't merged. Additionally, updating the Jira issue (adding the comment with the commit hash per branch) should be performed along updating the fix version.

...just as a hint for the future. I will go ahead and handle FLINK-40086

[davidradl]

@davidradl Thanks for looking into that. It might be better to not merge backports as long as the parent PR isn't merged. Additionally, updating the Jira issue (adding the comment with the commit hash per branch) should be performed along updating the fix version.

...just as a hint for the future. I will go ahead and handle FLINK-40086

Thanks @XComp for the pointers.