fix(view): refactor exec and execWorkspaces to call same methods

[lukekarrys]

Also cleanup json mode to not stringify and parse unnecessarily

[npm-cli-bot]

no statistically significant performance changes detected

timing results

app-large	clean	lock-only	cache-only	modules-only	no-lock	no-cache	no-modules	no-clean	show-version	run-script	cache-only peer-deps	no-clean audit
npm@latest	33.479 ±1.23	10.645 ±0.03	11.802 ±0.16	1.555 ±0.03	1.550 ±0.01	1.295 ±0.00	8.250 ±0.02	1.281 ±0.01	0.139 ±0.00	0.167 ±0.00	13.512 ±0.18	3.920 ±2.63
#7520	32.625 ±0.55	10.647 ±0.01	11.727 ±0.02	1.555 ±0.01	1.555 ±0.02	1.270 ±0.00	8.238 ±0.05	1.282 ±0.01	0.138 ±0.00	0.167 ±0.00	14.867 ±0.05	2.247 ±0.20

app-medium	clean	lock-only	cache-only	modules-only	no-lock	no-cache	no-modules	no-clean	show-version	run-script	cache-only peer-deps	no-clean audit
npm@latest	26.238 ±2.47	7.963 ±0.00	8.941 ±0.08	1.531 ±0.01	1.507 ±0.01	1.435 ±0.03	5.846 ±0.02	1.325 ±0.01	0.140 ±0.00	0.167 ±0.00	9.515 ±0.15	3.139 ±1.63
#7520	25.652 ±0.88	7.976 ±0.02	8.938 ±0.00	1.536 ±0.01	1.538 ±0.02	1.435 ±0.01	6.001 ±0.00	1.354 ±0.01	0.147 ±0.00	0.175 ±0.00	10.181 ±0.31	2.021 ±0.05