Add NumSubnets to the validator manager interface #3504
Merged
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Why this should be merged
This PR is factored out of #3388.
After ACP-77, there will be multiple ways to add validators to the validator manager. This makes the current sanity check invalid.
How this works
Rather than verifying that each subnet is empty, we can verify that all subnets are empty.
How this was tested
Added unit tests
Need to be documented in RELEASES.md?
No user facing changes.