[release-1.27] Fix agent supervisor port using apiserver port instead

[brandond]

Proposed Changes

Fix agent supervisor port using apiserver port instead

The agent's supervisor listener on RKE2 is using the wrong port. Didn't notice it here because they're the same in k3s.

Types of Changes

bugfix

Verification

Can only be tested in RKE2

Testing

Linked Issues

• [Release-1.27] - Expose RKE2 metrics via supervisor port rancher/rke2#6092 (comment)

User-Facing Change

NONE

Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 36.26%. Comparing base (76ba9db) to head (18415da).
Report is 1 commits behind head on release-1.27.

Files	Patch %	Lines
pkg/agent/https/https.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.27   #10356      +/-   ##
================================================
+ Coverage         36.12%   36.26%   +0.13%     
================================================
  Files               163      160       -3     
  Lines             16541    13962    -2579     
================================================
- Hits               5976     5063     -913     
+ Misses             9549     7902    -1647     
+ Partials           1016      997      -19     

Flag	Coverage Δ
e2etests	36.26% <50.00%> (-0.03%)	⬇️
unittests	?

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