Fix metrics

[openroad-ci]

Missing metric updates for #3879

designs/gf12/jpeg/rules-base.json updates:

Metric	Old	New	Type
placeopt__design__instance__count__stdcell	86979	102448	Failing
cts__timing__setup__ws	-38.5	-101.0	Failing
cts__timing__setup__tns	-154.0	-22300.0	Failing
cts__timing__hold__ws	-38.5	-25.0	Tighten
cts__timing__hold__tns	-154.0	-100.0	Tighten
globalroute__timing__setup__ws	-38.5	-118.0	Failing
globalroute__timing__setup__tns	-154.0	-11500.0	Failing
globalroute__timing__hold__ws	-38.5	-25.0	Tighten
globalroute__timing__hold__tns	-154.0	-100.0	Tighten
finish__timing__setup__ws	-38.5	-103.0	Failing
finish__timing__setup__tns	-154.0	-812.0	Failing
finish__timing__hold__ws	-38.5	-25.0	Tighten
finish__timing__hold__tns	-154.0	-100.0	Tighten

CI Could not Update Rules

[ERROR] asap7/mock-cpu: No metrics found, please check the latest CI build for issues.

[maliberty]

I'm surprised that a 5% increase in core util had a noticeably negative effect on final timing.

[eder-matheus]

I'm surprised that a 5% increase in core util had a noticeably negative effect on final timing.

I also updated clock period from 770 to 500. The core increase alone actually improved timing, so I changed the clock period to have negative slack.