fix: unpublish with scoped registry

[wraithgar]

Unpublish now works if you have a scoped registry config

Closes #5685

[npm-cli-bot]

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	36.976 ±4.22	15.562 ±0.05	14.317 ±0.14	16.702 ±0.69	2.637 ±0.03	2.714 ±0.05	2.175 ±0.01	10.025 ±0.12	2.127 ±0.02	3.750 ±0.65
#6082	42.583 ±2.83	15.260 ±0.07	14.209 ±0.08	16.707 ±0.13	2.623 ±0.00	2.657 ±0.01	2.061 ±0.04	9.813 ±0.03	2.114 ±0.03	3.211 ±0.04

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	25.525 ±0.44	12.409 ±0.03	11.078 ±0.10	11.886 ±0.27	2.494 ±0.03	2.399 ±0.00	2.232 ±0.01	7.595 ±0.03	2.089 ±0.01	4.724 ±2.53
#6082	28.654 ±4.78	12.085 ±0.14	11.180 ±0.15	11.811 ±0.18	2.447 ±0.03	2.462 ±0.01	2.129 ±0.05	7.569 ±0.06	1.986 ±0.01	2.943 ±0.13