chore: Do not validate API schema by default

[Stranger6667]

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[codecov-commenter]

Codecov Report

Merging #1402 (d4934f1) into master (d579fcd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1402   +/-   ##
=======================================
  Coverage   99.18%   99.18%           
=======================================
  Files          83       83           
  Lines        6418     6418           
  Branches     1132     1132           
=======================================
  Hits         6366     6366           
  Misses         26       26           
  Partials       26       26           

Flag	Coverage Δ
unittests	99.15% <ø> (ø)

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Impacted Files	Coverage Δ
src/schemathesis/_hypothesis.py	100.00% <ø> (ø)
src/schemathesis/cli/__init__.py	99.05% <ø> (ø)

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