test: Add v2 test coverage to test_net.py

[TheRealFalcon]

Proposed Commit Message

test: Add v2 test coverage to test_net.py

Ensure there is a corresponding v2 test for every v1 test in
`network_configs.py` where possible/reasonable.

Many tests are marked with `xfail` as they will not pass without
additional changes to the network rendering code.

Additional Context

I left the individual commits as they may (or may not) be more useful in reviewing. This PR should be squashed though.

Merge type

• [x] Squash merge using "Proposed Commit Message"
• [ ] Rebase and merge unique commits. Requires commit messages per-commit each referencing the pull request number (#<PR_NUM>)