Delete unused pretty-printing code

[ksaaskil]

• We previously had some pretty-printing instructions to console but it hasn't been used since one big refactoring, so might as well delete it now
• Also ignore interfaces.ts from code coverage

[codecov-io]

Codecov Report

Merging #333 into dev will increase coverage by 0.08%. The diff coverage is 0%.

@@            Coverage Diff            @@
##             dev     #333      +/-   ##
=========================================
+ Coverage   79.8%   79.88%   +0.08%     
=========================================
  Files         51       46       -5     
  Lines       2174     2148      -26     
  Branches     563      562       -1     
=========================================
- Hits        1735     1716      -19     
+ Misses       439      432       -7

Impacted Files	Coverage Δ
packages/unmock-core/src/backend/index.ts	83.05% <0%> (+1.08%)	:arrow_up:
packages/unmock-core/src/service/interfaces.ts
packages/unmock-core/src/interfaces.ts

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