feat: remove votes of removed masternodes when collateral is moved

[QuantumExplorer]

Issue being fixed or feature implemented

If a masternode would vote, they could move their collateral, and then issue a new vote, which would in essence allow people to vote forever, and break the system

What was done?

When a masternode is removed from the masternode list their votes are removed.

How Has This Been Tested?

Added a test.

Breaking Changes

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone