fix: close host cluster proxy watch when member clustr watch closed

[wy-lucky]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.

Project coverage is 33.63%. Comparing base (cb49360) to head (2234da6).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
.../registry/hpaaggregator/aggregation/forward/pod.go	0.00%	20 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #341      +/-   ##
==========================================
- Coverage   33.91%   33.63%   -0.28%     
==========================================
  Files         156      156              
  Lines       14730    18048    +3318     
==========================================
+ Hits         4995     6071    +1076     
- Misses       9214    11456    +2242     
  Partials      521      521              

Flag	Coverage Δ
unittests	33.63% <0.00%> (-0.28%)	⬇️

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