enable readOnlyRootFilesystem on subscription addon pod

[xiangjingli]

• I have taken backward compatibility into consideration.

https://issues.redhat.com/browse/ACM-8463

[mikeshng]

/approve

/lgtm

[openshift-ci]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9b397c5) 55.66% compared to head (c1244b5) 55.26%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #384      +/-   ##
==========================================
- Coverage   55.66%   55.26%   -0.40%     
==========================================
  Files          71       71              
  Lines       15315    15317       +2     
==========================================
- Hits         8525     8465      -60     
- Misses       5937     6003      +66     
+ Partials      853      849       -4     

Flag	Coverage Δ
unit	55.26% <ø> (-0.40%)	⬇️

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