Add packageManager field to package.json #270

Job	Run time
Lint	14s
Slow tests: defaults with npm	1m 28s
Slow tests: try-scenarios	1m 54s
Slow tests: typescript with npm	1m 33s
Tests (test-app-location)	17s
Slow tests: defaults with pnpm	1m 0s
Tests (addon-location)	13s
Slow tests: typescript with pnpm	54s
Tests (addon-only)	14s
Tests (monorepo with pnpm)	17s
Tests (declarations-configuration)	28s
Tests (monorepo with npm)	20s
Tests (rollup-build)	17s
	9m 9s

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