node-api: avoid SecondPassCallback crash

PR https://github.com/nodejs/node/pull/38000 added indirection so that we could stop finalization in cases where it had been scheduled in a second pass callback but we were doing it in advance in environment teardown.

Unforunately we missed that the code which tries to clear the second pass parameter checked if the pointer to the parameter (_secondPassParameter) was nullptr and that when the second pass callback was scheduled we set _secondPassParameter to nullptr in order to avoid it being deleted outside of the second pass callback. The net result was that we would not clear the _secondPassParameter contents and failed to avoid the Finalization in the second pass callback.

This PR adds an additional boolean for deciding if the secondPassParameter should be deleted outside of the second pass callback instead of setting secondPassParameter to nullptr thus avoiding the conflict between the 2 ways it was being used.

See the discussion starting at: https://github.com/nodejs/node/pull/38273#issuecomment-852403751 for how this was discovered on OSX while trying to upgrade to a new V8 version.

Signed-off-by: Michael Dawson mdawson@devrus.com