fix: recalculate stats when the program is updated

[EVODelavega]

Closes #11699

[cdummett]

Hey @EVODelavega, currently stats are being calculated correctly at the start of the epoch after an existing program is being updated 👍

e.g. these are all passing

go test -v ./core/integration/... --godog.format=pretty $(pwd)/core/integration/features/verified/enactment_HVMR.feature:115
go test -v ./core/integration/... --godog.format=pretty $(pwd)/core/integration/features/verified/enactment_VDPR.feature:111
go test -v ./core/integration/... --godog.format=pretty $(pwd)/core/integration/features/verified/enactment_RFPR.feature:121

But the stats are not being calculated at the start of the first epoch after a program is enacted when there is no program already active...

e.g. these are failing

go test -v ./core/integration/... --godog.format=pretty $(pwd)/core/integration/features/verified/enactment_HVMR.feature:74
go test -v ./core/integration/... --godog.format=pretty $(pwd)/core/integration/features/verified/enactment_VDPR.feature:73
go test -v ./core/integration/... --godog.format=pretty $(pwd)/core/integration/features/verified/enactment_RFPR.feature:80