[cli] Remove unnecessary await in Dev tests

[TooTallNate]

This is the result of VS Code's "remove all unneeded await calls" formatter.

[codecov]

Codecov Report

Merging #6572 (c0454cb) into main (2756d1e) will increase coverage by 0.86%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #6572      +/-   ##
==========================================
+ Coverage   12.31%   13.18%   +0.86%     
==========================================
  Files         272      272              
  Lines        9802     9931     +129     
  Branches     1628     1566      -62     
==========================================
+ Hits         1207     1309     +102     
- Misses       8497     8531      +34     
+ Partials       98       91       -7     

Impacted Files	Coverage Δ
src/util/metrics.ts	54.54% <0.00%> (-3.15%)	⬇️
src/util/dev/builder-cache.ts	67.46% <0.00%> (+2.99%)	⬆️
src/util/dev/server.ts	52.89% <0.00%> (+3.95%)	⬆️

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