[YUNIKORN-2807] Don't log 'task missing' as ERROR

[craigcondit]

What is this PR for?

When a task no longer exists but we have an event to process, we log very loudly. This is not uncommon, and happens frequently when pods are deleted. Log at DEBUG instead.

What type of PR is it?

• - Bug Fix
• - Improvement
• - Feature
• - Documentation
• - Hot Fix
• - Refactoring

Todos

• - Task

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-2807

How should this be tested?

Screenshots (if appropriate)

Questions:

• - The licenses files need update.
• - There is breaking changes for older versions.
• - It needs documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.07%. Comparing base (eed4ea1) to head (082e951).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #892   +/-   ##
=======================================
  Coverage   68.07%   68.07%           
=======================================
  Files          70       70           
  Lines        7575     7575           
=======================================
  Hits         5157     5157           
  Misses       2203     2203           
  Partials      215      215           

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[chia7712]

LGTM