[DOP-20817] Handle case taskMetrics=null

[dolfinus]

Change Summary

Update SparkMetricsRecorder & co to handle case when taskEndEvent.taskMetrics() is null.

Added tests covering exception raised on Spark executor side. Unfortunately, this does not trigger this check, because it can be reproduced only in environment with spark.master=yarn or spark.master=k8s, and caused by OOM killer, not just task failure.

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.45%. Comparing base (c18a4f2) to head (a4ea2a6).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
onetl/_metrics/listener/task.py	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #313      +/-   ##
===========================================
+ Coverage    95.23%   95.45%   +0.22%     
===========================================
  Files          225      225              
  Lines         8984     8986       +2     
  Branches       894      895       +1     
===========================================
+ Hits          8556     8578      +22     
+ Misses         307      290      -17     
+ Partials       121      118       -3     

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