assert: reduce diff noise
Assertion errors that produce a diff show a diff for identical entries in case one side of the comparison has more object properties than the other one. Those lines are now taken into account and will not show up as diverging lines anymore.
Refs: https://github.com/nodejs/node/issues/22763
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