Add supervisor cert/key to rotate list

[brandond]

Proposed Changes

• We added a new cert a while back in Do not use the admin kubeconfig for the supervisor and core controllers #7616, but didn't add it to the rotate list.

Types of Changes

bugfix

Verification

See linked issue

Testing

Yes

Linked Issues

• Add client-supervior.crt and client-supervior.key to the rotation list #9831

User-Facing Change

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.72%. Comparing base (7f65975) to head (aa5c347).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9832      +/-   ##
==========================================
- Coverage   52.67%   46.72%   -5.96%     
==========================================
  Files         157      157              
  Lines       13822    13826       +4     
==========================================
- Hits         7281     6460     -821     
- Misses       5155     6129     +974     
+ Partials     1386     1237     -149     

Flag	Coverage Δ
e2etests	39.76% <100.00%> (-9.50%)	⬇️
inttests	39.42% <100.00%> (+17.28%)	⬆️
unittests	16.86% <100.00%> (+0.03%)	⬆️

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