Client (mesh egress) discovery for Jobs and Numaflow (vertices and monovertices)

[aattuluri]

Checklist

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• I've read and agree to the project's contribution guidelines.
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Description

What does this change do and why?
This change introduces client discovery where there is no ingress but only mesh egress required like k8s Jobs, numaflow Vertices and Monovertices.

[Link to related ISSUE]

Thank you!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.93103% with 128 lines in your changes missing coverage. Please review.

Project coverage is 63.73%. Comparing base (323801a) to head (72623ae).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
admiral/pkg/controller/admiral/job.go	80.40%	24 Missing and 5 partials ⚠️
admiral/pkg/controller/admiral/monovertex.go	83.00%	22 Missing and 4 partials ⚠️
admiral/pkg/controller/admiral/vertex.go	83.55%	21 Missing and 4 partials ⚠️
admiral/pkg/clusters/clientdiscovery_handler.go	42.85%	23 Missing and 1 partial ⚠️
admiral/pkg/clusters/handler.go	18.75%	13 Missing ⚠️
admiral/pkg/clusters/registry.go	60.00%	5 Missing and 3 partials ⚠️
admiral/cmd/admiral/cmd/root.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #339      +/-   ##
==========================================
- Coverage   71.75%   63.73%   -8.03%     
==========================================
  Files          66       91      +25     
  Lines        9446    11926    +2480     
==========================================
+ Hits         6778     7601     +823     
- Misses       2295     3911    +1616     
- Partials      373      414      +41     

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