Revert "Prioritize url credentials over netrc"

Allow pre-release to satisfy build requirements

Opt to check build dependencies

This was the only call-site for this method and, realistically, it is
highly coupled with the legacy resolver's dependency resolution
strategy/approach; so it makes sense for this code to live as part of
the resolver, rather than the container object the various resolvers.

Filter out build requirements that require an extra to be used

Clarify that you don't need to add backticks for output

There is no mechanism provided for build requirements to have extras.

It should be acceptable to enforce that any "optional" packages
that are supposed to be conditionally installed based on the presence of
an extra should not be installed in a build environment.

Fix REQUESTED in presence of URL constraints

``pip config`` normalizes names, converting underscores into dashes

Fix `22.1b1` version in changelog

This reverts commit 0c284520.

Run `towncrier build` instead of `towncrier`

Newer versions of towncrier exit eagerly, when `towncrier --version` is
run only printing the version and not actually doing any news file
generation.

This reverts commit 84ee57d1.