Handle NotifyCreateRef as create branch in feeds

[CirnoT]

A rather ugly workaround for the fact that NotifyCreateRef must use ActionCommitRepo.

This is basically how everyone else has to deal with it for webhooks (which follow how GH does it) to catch 'create branch' event.

Avoids having two 'pushed to {{branch}}` actions, one empty and another with actual commits, on dashboard feeds.

[codecov-io]

Codecov Report

Merging #14245 (675221e) into master (21fbee1) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #14245   +/-   ##
=======================================
  Coverage   41.96%   41.97%           
=======================================
  Files         735      735           
  Lines       78933    78933           
=======================================
+ Hits        33126    33131    +5     
+ Misses      40350    40347    -3     
+ Partials     5457     5455    -2     

Impacted Files	Coverage Δ
models/error.go	38.49% <0.00%> (-0.49%)	⬇️
modules/log/event.go	59.90% <0.00%> (+0.94%)	⬆️
modules/git/batch_reader_nogogit.go	46.26% <0.00%> (+1.49%)	⬆️
modules/indexer/stats/db.go	52.00% <0.00%> (+4.00%)	⬆️
modules/git/repo_language_stats_nogogit.go	63.82% <0.00%> (+6.38%)	⬆️

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[lafriks]

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