[GOBBLIN-1456] do not remove spec on update

[arjun4084346]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!
@jack-moseley @Will-Lo please review

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-1456

Description

• Here are some details about my PR, including screenshots (if applicable):
  GobblinServiceJobScheduler update logic first deletes the spec and then adds it back. I think it is unnecessary and also create an issue. During delete spec it calls Orchestrator remove code and that sends a delete call to spec executor, which is wrong, because flow spec is actually not intended to be deleted. On cluster side, it is forcing a state store deletion.
  This PR will remove the delete part.

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:
  trivial changes. tested locally

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 46.55%. Comparing base (557f255) to head (4f225a2).
⚠️ Report is 798 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3295      +/-   ##
============================================
- Coverage     46.55%   46.55%   -0.01%     
+ Complexity    10036    10031       -5     
============================================
  Files          2037     2037              
  Lines         79294    79290       -4     
  Branches       8843     8843              
============================================
- Hits          36919    36911       -8     
- Misses        38950    38952       +2     
- Partials       3425     3427       +2     

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[arjun4084346]

@sv2000 please merge

[sv2000]

+1.