[Signer] Make any miner's block proposal that passes initial checks count towards miner activity/validity #3802

Job	Run time
Check Access Permissions	8s
Check Packages and Shards	1m 43s
Mutation Testing - Normal, Stackslib	11m 12s
Mutation Testing - Normal, Stacks Node	11m 12s
Mutation Testing - Normal, Small	0s
Mutation Testing - Shards, Small	0s
Mutation Testing - Shards, Stackslib	0s
Mutation Testing - Shards, Stacks Node	0s
Mutation Testing - Normal, Stacks Signer	0s
Output Mutants	2s
	24m 17s

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