(fix): Use venv created by pre-commit for validate config

[enochtangg]

The validate-configs-syntax pre-commit hook should be using the venv created by pre-commit by default when specifying language: python. Calling python3 ./snuba/validate_configs.py does not import the current directory by default. This can be achieved by running the library module as a script. Thanks @asottile-sentry for the reference.

[codecov-commenter]

Codecov Report

Base: 93.04% // Head: 92.82% // Decreases project coverage by -0.21% ⚠️

Coverage data is based on head (6035d1f) compared to base (246571b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3166      +/-   ##
==========================================
- Coverage   93.04%   92.82%   -0.22%     
==========================================
  Files         678      688      +10     
  Lines       31010    31078      +68     
==========================================
- Hits        28852    28847       -5     
- Misses       2158     2231      +73     

Impacted Files	Coverage Δ
snuba/consumers/consumer_builder.py	41.59% <0.00%> (-49.56%)	⬇️
snuba/cli/consumer.py	68.62% <0.00%> (-27.46%)	⬇️
snuba/environment.py	83.33% <0.00%> (-16.67%)	⬇️
snuba/utils/streams/metrics_adapter.py	66.66% <0.00%> (-8.34%)	⬇️
tests/utils/test_package_no_import/__init__.py	100.00% <0.00%> (ø)
tests/utils/test_package_auto_import/__init__.py	100.00% <0.00%> (ø)
tests/utils/test_package_auto_import/c.py	100.00% <0.00%> (ø)
tests/clickhouse/translators/test_auto_import.py	100.00% <0.00%> (ø)
tests/utils/test_package_no_import/a.py	100.00% <0.00%> (ø)
tests/utils/test_package_auto_import/b.py	100.00% <0.00%> (ø)
... and 7 more

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[asottile-sentry]

good enough improvement for now 👍