Call on_tick on every skipped slot for spectests (#11262)

New spectests ensure that we call on_tick for every slot between the
last tick and the current one. This PR fixes that

Co-authored-by: Raul Jordan <raul@prysmaticlabs.com>
Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

testing/spectest/shared/common/forkchoice/builder.go

@@ -37,12 +37,17 @@ func NewBuilder(t testing.TB, initialState state.BeaconState, initialBlock inter
 // Tick resets the genesis time to now()-tick and adjusts the slot to the appropriate value.
 func (bb *Builder) Tick(t testing.TB, tick int64) {
 	bb.service.SetGenesisTime(time.Unix(time.Now().Unix()-tick, 0))
-	bb.service.ForkChoicer().SetGenesisTime(uint64(time.Now().Unix() - tick))
-	if tick > bb.lastTick {
-		slot := uint64(tick) / params.BeaconConfig().SecondsPerSlot
-		require.NoError(t, bb.service.ForkChoicer().NewSlot(context.TODO(), types.Slot(slot)))
-		bb.lastTick = tick
+	lastSlot := uint64(bb.lastTick) / params.BeaconConfig().SecondsPerSlot
+	currentSlot := uint64(tick) / params.BeaconConfig().SecondsPerSlot
+	for lastSlot < currentSlot {
+		lastSlot++
+		bb.service.ForkChoicer().SetGenesisTime(uint64(time.Now().Unix() - int64(params.BeaconConfig().SecondsPerSlot*lastSlot)))
+		require.NoError(t, bb.service.ForkChoicer().NewSlot(context.TODO(), types.Slot(lastSlot)))
 	}
+	if tick > int64(params.BeaconConfig().SecondsPerSlot*lastSlot) {
+		bb.service.ForkChoicer().SetGenesisTime(uint64(time.Now().Unix() - tick))
+	}
+	bb.lastTick = tick
 }
 
 // block returns the block root.