Enforce that shapely be >=2.0.0 and unify reproject_*

[jsignell]

Description: I ran into this while working on #440 and then noticed it again when I started on #362. Seems like a nice simplification.

PR checklist:

• [x] Code is formatted (run scripts/format).
• [x] Code lints properly (run scripts/lint).
• [x] Tests pass (run scripts/test).
• [x] Documentation has been updated to reflect changes, if applicable.
• [x] Changes are added to the CHANGELOG.

[jsignell]

Just a note that I was wondering why the minimum tests were just starting to say that they were failing and I think it's because some tests were getting skipped because the env wasn't resolving properly. See this job on main: https://github.com/stac-utils/stactools/actions/runs/5358201926/jobs/9720151038#step:5:46