refactor(plugin-js-packages): provide package json path + e2e test #5640

Job	Run time
Format check	42s
Integration tests (ubuntu-latest)	42s
Unit tests (ubuntu-latest)	47s
Linter	1m 17s
Integration tests (windows-latest)	1m 39s
Unit tests (windows-latest)	1m 35s
Integration tests (macos-latest)	51s
Unit tests (macos-latest)	40s
Build	49s
E2E tests (ubuntu-latest)	1m 8s
E2E tests (windows-latest)	2m 15s
E2E tests (macos-latest)	57s
	13m 22s

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