fix: dont export include-workspace-root to env

[nlf]

this fixes npm run test-all for ourselves, and likely may help with scripts that somehow end up recursive (because at least only the root will be run once)

[nlf]

closing in favor of #4645

[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	53.741 ±1.90	28.517 ±1.47	27.884 ±17.01	18.281 ±0.53	2.825 ±0.07	2.922 ±0.01	2.261 ±0.04	10.199 ±0.11	2.217 ±0.02	3.086 ±0.07
#4675	49.623 ±2.75	28.095 ±0.06	16.024 ±0.63	18.859 ±0.95	2.793 ±0.05	2.806 ±0.16	2.240 ±0.06	10.767 ±0.18	2.127 ±0.06	3.242 ±0.18

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	36.441 ±0.75	21.976 ±0.08	12.053 ±0.06	12.757 ±0.20	2.536 ±0.04	2.393 ±0.01	2.168 ±0.11	8.085 ±0.15	2.116 ±0.04	2.645 ±0.03
#4675	36.320 ±3.10	21.998 ±0.75	12.232 ±0.29	12.966 ±0.29	2.446 ±0.01	2.414 ±0.04	2.194 ±0.08	8.050 ±0.09	1.995 ±0.01	2.826 ±0.12