benchmark: remove v8ForceOptimization calls
#9615 removed common.v8ForceOptimization along with most of the calls to it but these were left behind. This removes common.v8ForceOptimization calls from url and vm benchmark files.
Fixes: https://github.com/nodejs/node/issues/11895
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
benchmark