This stabilizes the behavior introduced in #16565 which (roughly) tries
to match an import like `import a.b.c` to an actual directory path
`a/b/c` in order to label it as first-party, rather than simply looking
for a directory `a`.

Mainly this affects the sorting of imports in the presence of namespace
packages, but a few other rules are affected as well.

This stabilizes the behavior introduced in #16565 which (roughly) tries
to match an import like `import a.b.c` to an actual directory path
`a/b/c` in order to label it as first-party, rather than simply looking
for a directory `a`.

Mainly this affects the sorting of imports in the presence of namespace
packages, but a few other rules are affected as well.

This stabilizes the behavior introduced in #16565 which (roughly) tries
to match an import like `import a.b.c` to an actual directory path
`a/b/c` in order to label it as first-party, rather than simply looking
for a directory `a`.

Mainly this affects the sorting of imports in the presence of namespace
packages, but a few other rules are affected as well.

This stabilizes the behavior introduced in #16565 which (roughly) tries
to match an import like `import a.b.c` to an actual directory path
`a/b/c` in order to label it as first-party, rather than simply looking
for a directory `a`.

Mainly this affects the sorting of imports in the presence of namespace
packages, but a few other rules are affected as well.

* main: (26 commits)
  Ignore deprecated rules unless selected by exact code (#20167)
  Stabilize adding future import via config option (#20277)
  [`flake8-errmsg`] Stabilize extending `raw-string-in-exception` (`EM101`) to support byte strings (#20273)
  Stabilize the remaining Airflow rules (#20250)
  [`flake8-bugbear`] Stabilize support for non-context-manager calls in `assert-raises-exception` (`B017`) (#20274)
  [`flake8-commas`] Stabilize support for trailing comma checks in type parameter lists (`COM812`, `COM819`) (#20275)
  [`pygrep_hooks`] Stabilize using`AsyncMock` methods in `invalid-mock-access` (`PGH005`) (#20272)
  Stabilize new strategy for classifying imports as first party (#20268)
  [`pylint`] Stabilize ignoring `__init__.py` for `useless-import-alias` (`PLC0414`) (#20271)
  [`pylint`] Stabilize adding U+061C to `bidirectional-unicode` (`PLE2502`) (#20276)
  [`flake8-simplify`] Stabilize fix safety of `multiple-with-statements` (`SIM117`) (#20270)
  Stabilize `pytest-raises-ambiguous-pattern` (`RUF043`) (#20253)
  Stabilize `f-string-number-format` (`FURB116`) (#20247)
  [`pyupgrade`] Remove `non-pep604-isinstance` (`UP038`) (#19156)
  [`pandas-vet`] Remove `pandas-df-variable-name` (`PD901`) (#19223)
  Remove deprecated macOS config file discovery (#19210)
  Stabilize `redundant-none-literal` (`PYI061`) (#20236)
  Stabilize `generic-not-last-base-class` (`PYI059`) (#20246)
  Stabilize `useless-class-metaclass-type` (`UP050`) (#20230)
  Stabilize `os-symlink` (`PTH211`) (#20229)
  ...