install should not do full lock resolution, as that is the purpose of pipenv lock

[matteius]

The issue and fixes

Fixes #6267

• refactor the install routines further to provide clarity and meet the goal of not doing full lock resolution, which was intended as we moved to 2024.x release series. See: https://github.com/pypa/pipenv/pull/6098

Possibly fixes #6231 Possibly fixes #6187 Possibly fixes #6068

The checklist

• [X] Associated issue
• [ ] A news fragment in the news/ directory to describe this fix with the extension .bugfix.rst, .feature.rst, .behavior.rst, .doc.rst. .vendor.rst. or .trivial.rst (this will appear in the release changelog). Use semantic line breaks and name the file after the issue number or the PR #.