[v10.x] backport #26599 (process: add --unhandled-rejections flag)
Backporting #26599 was not completely trivial, since there where so many changes that required a work around. Functionality wise it should now be identical.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines