fix: consolidate bugs, docs, repo command logic

[wraithgar]

All three of these commands do the same thing: open a manifest and find
a url inside to open it. The finding of that manifest was not very
consistent across these three commands. Some work with workspaces while
others don't. Some work correctly with --prefix while others don't.

This PR consolidates these commands so that they all are consistent in
how they find the manifest being referenced. The specifics of which url
they open are still left to each command. The util that only these
three commands were using was consolidated into their base class.

[npm-robot]

no statistically significant performance changes detected

timing results

app-large	clean	lock-only	cache-only	cache-only peer-deps	modules-only	no-lock	no-cache	no-modules	no-clean	no-clean audit
npm@8	51.123 ±6.02	28.063 ±0.12	16.012 ±0.02	18.271 ±0.91	2.604 ±0.03	2.558 ±0.04	2.049 ±0.02	10.446 ±0.05	2.012 ±0.02	2.993 ±0.10
#4857	47.446 ±2.47	28.246 ±0.09	15.817 ±0.11	18.969 ±0.65	2.578 ±0.01	2.573 ±0.04	2.052 ±0.03	10.766 ±0.02	2.058 ±0.02	3.206 ±0.22

app-medium	clean	lock-only	cache-only	cache-only peer-deps	modules-only	no-lock	no-cache	no-modules	no-clean	no-clean audit
npm@8	36.934 ±2.37	21.460 ±0.15	11.568 ±0.12	12.565 ±0.00	2.333 ±0.01	2.334 ±0.00	2.068 ±0.01	7.662 ±0.17	1.895 ±0.02	2.629 ±0.03
#4857	35.150 ±0.85	21.850 ±0.37	11.587 ±0.07	12.569 ±0.16	2.340 ±0.05	2.360 ±0.00	2.060 ±0.05	7.675 ±0.12	1.923 ±0.02	2.729 ±0.07

[nlf]

🎉 consistency! 🎉