Squashing Commits of PR#4092

[Blazer-007]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-XXX

Description

• Here are some details about my PR, including screenshots (if applicable):
  This PR squashes all the commits of [GOBBLIN-2189] Implement ContainerCompletion callback in DynamicScalingYarnService #4092 into single commit

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.37%. Comparing base (adef734) to head (cfbfdca).
Report is 15 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4100      +/-   ##
============================================
- Coverage     45.38%   45.37%   -0.01%     
+ Complexity     3192     3191       -1     
============================================
  Files           696      696              
  Lines         26628    26628              
  Branches       2655     2655              
============================================
- Hits          12085    12083       -2     
- Misses        13542    13543       +1     
- Partials       1001     1002       +1     

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