report: handle on-fatalerror better

--report-on-fatalerror was not honored properly, as there was no
way to check the value which was stored in the Environment pointer
which can be inaccessible under certain fatal error situations.

Move the flag out of Environment pointer so that this is doable.

Co-authored-by: Shobhit Chittora <schittora@paypal.com>

PR-URL: https://github.com/nodejs/node/pull/32207
Fixes: https://github.com/nodejs/node/issues/31576
Refs: https://github.com/nodejs/node/pull/29881


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>