Always process an Add operation for client discovery

[aattuluri]

Checklist

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• I've read and agree to the project's contribution guidelines.
• I'm requesting to pull a topic/feature/bugfix branch.
• I checked that my code additions will pass code linting checks and unit tests.
• I updated unit and integration tests (if applicable).
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Description

What does this change do and why?

[Link to related ISSUE]

Thank you!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review.

Project coverage is 63.74%. Comparing base (eb58c1d) to head (dbdfec2).

Files with missing lines	Patch %	Lines
admiral/pkg/controller/admiral/job.go	85.71%	1 Missing ⚠️
admiral/pkg/controller/admiral/monovertex.go	85.71%	1 Missing ⚠️
admiral/pkg/controller/admiral/vertex.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #357      +/-   ##
==========================================
+ Coverage   63.72%   63.74%   +0.02%     
==========================================
  Files          91       91              
  Lines       11922    11913       -9     
==========================================
- Hits         7597     7594       -3     
+ Misses       3911     3908       -3     
+ Partials      414      411       -3     

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