[DRAFT] typing: strongly type sentry.snuba.metrics.query_builder

[cursor]

Summary

• remove sentry.snuba.metrics.query_builder from the sentry modules with typing issues override list in pyproject.toml
• fix all mypy errors in src/sentry/snuba/metrics/query_builder.py by tightening type narrowing and aligning internal helper typing without changing runtime behavior
• preserve existing metric operation param behavior while satisfying strict typing checks

Testing

• PATH=".venv/bin:$PATH" .venv/bin/python -m tools.mypy_helpers.mypy_without_ignores src/sentry/snuba/metrics/query_builder.py
• PATH=".venv/bin:$PATH" .venv/bin/pytest -n3 -svv --reuse-db tests/sentry/test_mypy_stronglist.py
• PATH=".venv/bin:$PATH" .venv/bin/pytest -n3 -svv --reuse-db tests/sentry/snuba/metrics/test_query_builder.py
• PATH=".venv/bin:$PATH" .venv/bin/prek run -q

cc @armenzg for review.

Legal Boilerplate

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.