release-4.18: return null from rollout decorator so Topology URL links render (#11176)

[keithchong]

Same fix as #299 but for the release-4.18 branch

[coderabbitai]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release-4.18@be94411). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...opology/decorators/getArgoRolloutNodeDecorator.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##             release-4.18     #300   +/-   ##
===============================================
  Coverage                ?   12.76%           
===============================================
  Files                   ?      172           
  Lines                   ?     6839           
  Branches                ?     2247           
===============================================
  Hits                    ?      873           
  Misses                  ?     5965           
  Partials                ?        1           

Flag	Coverage Δ
unit-tests	12.76% <0.00%> (?)

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[aali309]

LGTM!