emptyBlockPeriodSeconds should take validator voting into account

[roderik]

Steps to Reproduce

1. Send qbft voting json-rpc in a network producing empty blocks
2. Validator change goes in effect only after 2 empty blocks with the slower emptyBlockPeriodSeconds

Expected behavior:

After voting, it should build a block to make the change go into effect at the speed of the secondsPerBlock, not emptyBlockPeriodSeconds

Actual behavior:

The node does not consider these votes as transactions, not reverting to the lower block seconds

Frequency: [What percentage of the time does it occur?]

100% reproducable

Logs

Please post relevant logs from Besu (and the consensus client, if running proof of stake) from before and after the issue.

Versions (Add all that apply)

• Software version: 24.10.0

cc @amsmota