unset PKG_EXECPATH before invoking safe-chain binary #979

Job	Run time
Run E2E tests (18, latest, latest, 10.0.0)	24m 8s
Run unit tests and linting (macos-latest)	48s
Run unit tests and linting (ubuntu-latest)	39s
Run unit tests and linting (windows-latest)	44s
Run E2E tests (22, 10.2.0, 4.0.0, 9.0.0)	23m 47s
Run E2E tests (18, 9.0.0, 3.6.0, 8.0.0)	25m 52s
Run E2E tests (24, latest, latest, latest)	23m 46s
Run E2E tests (20, 10.2.0, 4.0.0, 9.0.0)	23m 33s
Run E2E tests (22, latest, latest, latest)	24m 7s
Run E2E tests (20, 9.0.0, latest, 10.0.0)	25m 4s
	2h 52m 28s

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