Run scripts/check as part of scripts/test locally

[florimondmanca]

scripts/test ought to be "check the code as CI does", but we weren't running scripts/check as part of it so far so it wouldn't catch issues that would surface in the Check CI job.

Eg this bit me in #29

[codecov-io]

Codecov Report

Merging #30 into master will increase coverage by 35.63%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #30       +/-   ##
=========================================
+ Coverage   64.36%   100%   +35.63%     
=========================================
  Files           9      9               
  Lines         348    354        +6     
=========================================
+ Hits          224    354      +130     
+ Misses        124      0      -124

Impacted Files	Coverage Δ
tests/test_trace_middleware.py	100% <100%> (+46.31%)	⬆️
src/ddtrace_asgi/middleware.py	100% <0%> (+7.69%)	⬆️
tests/applications/starlette.py	100% <0%> (+33.33%)	⬆️
tests/applications/fastapi.py	100% <0%> (+33.33%)	⬆️
tests/applications/raw.py	100% <0%> (+75%)	⬆️

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