fix: publish of tarballs includes README in packument

[fritzy]

When pacote is used for prepping a tarball for publish (non directory publishes), invoke with fullReadJSON: true so that the README is included in the tarball.

Closes #3548

[npm-robot]

found 20 benchmarks with statistically significant performance improvements

• app-large: clean, lock-only, cache-only, cache-only:peer-deps, modules-only, no-lock, no-cache, no-modules, no-clean, no-clean:audit
• app-medium: clean, lock-only, cache-only, cache-only:peer-deps, modules-only, no-lock, no-cache, no-modules, no-clean, no-clean:audit

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	59.638 ±0.66	27.812 ±0.19	25.759 ±13.19	18.018 ±0.29	2.814 ±0.01	2.694 ±0.06	2.096 ±0.06	10.511 ±0.12	2.105 ±0.07	2.935 ±0.05
#4480	0.414 ±0.01	0.367 ±0.01	0.362 ±0.01	0.397 ±0.00	0.401 ±0.01	0.362 ±0.00	0.405 ±0.01	0.374 ±0.00	0.406 ±0.00	0.394 ±0.01

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	37.615 ±1.78	21.379 ±0.02	11.768 ±0.14	12.366 ±0.46	2.496 ±0.04	2.457 ±0.06	1.993 ±0.02	7.923 ±0.00	2.103 ±0.00	2.610 ±0.08
#4480	0.364 ±0.00	0.392 ±0.04	0.381 ±0.00	0.401 ±0.00	0.386 ±0.03	0.402 ±0.01	0.362 ±0.00	0.392 ±0.04	0.370 ±0.00	0.380 ±0.01

[wraithgar]

yay