fix: return version from package.json instead of "N/A" when pm2_env.c…

[fbeqirllari]

…wd is different than pm2_env.exec_path

Q	A
Bug fix?	yes/no
New feature?	yes/no
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets	#1234, #5678
License	MIT
Doc PR	https://github.com/pm2-hive/pm2-hive.github.io/pulls

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