Fix #1269

Close #1264

* Fix: support conda in environment detection

* Docs: add news fragment

* Fix doc

* Make pdm.lock metadata.files sorting idempotent

In #1203 pdm.lock was changed to store a list of URLs rather than wheel
names. That change caused a regression because we were sorting the
output based on filename only, not the full URL.

This caused unnecessary lockfile changes in our CI environment.

Fixes #1256
Co-authored-by: NHashem Nasarat <hnasarat@beta.team>

This changes the logic when using an env_file such that any
environment variables defined within it do not override existing set
environment variables. This matches the default logic of dotenv and
should match user expectations.

Close #1237

* fix: don't save python path for venv commands

* improve the error message

* add test to cover changed code

* fix test

* reuse the saved python if possible

The list has 5 items, not 4.

Fix #1219

* feat(completion): support pwsh (PowerShell Core)

* chore: add news for pwsh completion support

* pyupgrade --py37-plus

* Remove unused imports

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ciCo-authored-by: Npre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

* Fix typos discovered by codespell

* Add codespell to pre-commit

* https://github.com/actions/cache/releases
* https://github.com/actions/setup-python/releases
* https://github.com/codecov/codecov-action/releases