Sync port forward wrapping should call async_run_forever

[jacobtomlinson]

Closes #566

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.09%. Comparing base (87063fc) to head (18a1701).
Report is 173 commits behind head on main.

Files with missing lines	Patch %	Lines
kr8s/portforward.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #567      +/-   ##
==========================================
- Coverage   94.61%   94.09%   -0.53%     
==========================================
  Files          29       30       +1     
  Lines        3141     4214    +1073     
==========================================
+ Hits         2972     3965     +993     
- Misses        169      249      +80     

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