Remove Yahoo from Prebid

[kmjennison]

FYI, steps in this process:

• removed the Yahoo module from Prebid's modules.json
• yarn run prebid:build: built Prebid from source, which generates the pb.js that contains Prebid base code and all modules
• modified our Prebid config to remove Yahoo from the ad unit configuration

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (14bc439) 96.73% compared to head (cc545d6) 96.73%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   96.73%   96.73%           
=======================================
  Files          31       31           
  Lines         673      673           
  Branches      144      144           
=======================================
  Hits          651      651           
  Misses         21       21           
  Partials        1        1           

Impacted Files	Coverage Δ
src/providers/prebid/prebidBidder.js	95.65% <ø> (ø)
src/utils/test-fixtures.js	100.00% <ø> (ø)

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