Remove favourite function - causing traffic

[ranguard]

Getting favourite data on the API is called... A LOT! - this is in 24 hours

This removes fetching/displaying fav information - I've left it in https://metacpan.org/account/favorite/list in case anyone wants to extract their old data

[oalders]

I think this is fine as a temporary measure. I'd like to defer to @haarg on the diff, though.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.23%. Comparing base (db5168b) to head (d24c29f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3380      +/-   ##
==========================================
- Coverage   73.48%   73.23%   -0.26%     
==========================================
  Files          67       67              
  Lines        2346     2346              
  Branches      331      331              
==========================================
- Hits         1724     1718       -6     
- Misses        496      501       +5     
- Partials      126      127       +1     

Files with missing lines	Coverage Δ
lib/MetaCPAN/Web/Model/ReleaseInfo.pm	82.05% <ø> (ø)

... and 2 files with indirect coverage changes

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