[now-cli] Add tests for alias rules

[AndyBitz]

Add integration tests for alias -r rules.json

[codecov-io]

Codecov Report

Merging #3003 into canary will decrease coverage by 1.3%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           canary    #3003      +/-   ##
==========================================
- Coverage   13.27%   11.96%   -1.31%     
==========================================
  Files         268      268              
  Lines       10329    10180     -149     
  Branches     1223     1295      +72     
==========================================
- Hits         1371     1218     -153     
+ Misses       8896     8870      -26     
- Partials       62       92      +30

Impacted Files	Coverage Δ
src/util/dev/server.ts	61.21% <0%> (-5.69%)	⬇️
src/util/dev/yarn-installer.ts	85.71% <0%> (-5.03%)	⬇️
src/util/dev/builder.ts	73.07% <0%> (-4.35%)	⬇️
src/util/dev/router.ts	78.57% <0%> (-4.13%)	⬇️
src/util/dev/builder-cache.ts	77.27% <0%> (-3.48%)	⬇️
src/util/metrics.ts	68.18% <0%> (-2.41%)	⬇️
src/util/projects/get-project-by-id-or-name.ts	28.57% <0%> (+3.57%)	⬆️
src/util/prefer-v2-deployment.ts	61.9% <0%> (+5.65%)	⬆️

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[TooTallNate]

Adding new tests reduces code coverage by 1.3%. Go home @codecov-io, you're drunk 😆