add default imagePullSecrets for gitops addon

[xiangjingli]

• I have taken backward compatibility into consideration.

[openshift-ci]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.13%. Comparing base (678fa98) to head (99cbf57).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #425      +/-   ##
==========================================
+ Coverage   55.79%   56.13%   +0.34%     
==========================================
  Files          96       96              
  Lines       15727    15727              
==========================================
+ Hits         8775     8829      +54     
+ Misses       6068     6012      -56     
- Partials      884      886       +2     

Flag	Coverage Δ
unit	56.13% <ø> (+0.34%)	⬆️

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