Port health: Use background loading

[arjunsalyan]

This improves performance for the port details page because port-health is an expensive query.

[codecov[bot]]

Codecov Report

Merging #327 (d46d702) into main (fc36171) will decrease coverage by 0.09%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #327      +/-   ##
==========================================
- Coverage   81.45%   81.35%   -0.10%     
==========================================
  Files         111      111              
  Lines        2750     2752       +2     
  Branches      214      214              
==========================================
- Hits         2240     2239       -1     
- Misses        464      467       +3     
  Partials       46       46              

Impacted Files	Coverage Δ
port/views.py	67.60% <0.00%> (-1.69%)	:arrow_down:

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[mascguy]

Arjun, thanks again for all of the work you've done - and continue to do - for the site. Great stuff!

[arjunsalyan]

While this has improved the loading time of port-details page, port health is still taking ages to load. That query needs to be improved.