fix: Excessive reference inlining in large schemas

[Stranger6667]

Fixes #945

[codecov-io]

Codecov Report

Merging #946 (94be3eb) into master (2ca9f50) will decrease coverage by 0.26%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #946      +/-   ##
==========================================
- Coverage   99.77%   99.50%   -0.27%     
==========================================
  Files          66       66              
  Lines        4465     4485      +20     
  Branches      735      739       +4     
==========================================
+ Hits         4455     4463       +8     
- Misses          3       12       +9     
- Partials        7       10       +3     

Flag	Coverage Δ
unittests	99.50% <83.33%> (-0.23%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/schemathesis/runner/impl/core.py	97.39% <25.00%> (-1.29%)	⬇️
src/schemathesis/extra/pytest_plugin.py	96.59% <66.66%> (-3.41%)	⬇️
src/schemathesis/schemas.py	100.00% <100.00%> (ø)
src/schemathesis/specs/openapi/_hypothesis.py	100.00% <100.00%> (ø)
src/schemathesis/specs/openapi/schemas.py	100.00% <100.00%> (ø)
src/schemathesis/cli/callbacks.py	98.19% <0.00%> (-1.81%)	⬇️
src/schemathesis/utils.py	98.37% <0.00%> (-1.63%)	⬇️
src/schemathesis/cli/__init__.py	98.83% <0.00%> (-1.17%)	⬇️

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