Iterating on codecov config

[tiffon]

Which problem is this PR solving?

Inadvertently removed all codecov status checks from master in a previous PR.

Short description of the changes

This adds project and patch based on the default config with the change that patch.default.only_pulls is set to true.

[codecov]

Codecov Report

Merging #418 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #418      +/-   ##
==========================================
+ Coverage   91.41%   91.46%   +0.05%     
==========================================
  Files         174      174              
  Lines        3915     3915              
  Branches      897      897              
==========================================
+ Hits         3579     3581       +2     
+ Misses        298      296       -2     
  Partials       38       38

Impacted Files	Coverage Δ
...eViewer/TimelineHeaderRow/TimelineViewingLayer.tsx	91.52% <0%> (+3.38%)	⬆️

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