Add SignerEvent::NewNakamotoBlock and do not update a block to GloballyAccepted until event arrives #3520

Job	Run time
Check Access Permissions	2s
Check Packages and Shards	1m 27s
Mutation Testing - Normal, Small	9m 24s
Mutation Testing - Shards, Small	0s
Mutation Testing - Shards, Stackslib	0s
Mutation Testing - Normal, Stackslib	0s
Mutation Testing - Normal, Stacks Node	23m 22s
Mutation Testing - Shards, Stacks Node	0s
Mutation Testing - Normal, Stacks Signer	0s
Output Mutants	5s
	34m 20s

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