add lookback checks to `check_consensus_block_proposals` task #283

Job	Run time
Run code checks / Run code checks	1m 0s
Generate project documentation	3s
Build Assertoor / Build macos/arm64 binary	40s
Build Assertoor / Build macos/amd64 binary	38s
Build Assertoor / Build linux/amd64 binary	34s
Build Assertoor / Build linux/arm64 binary	1m 42s
Build Assertoor / Build windows/amd64 binary	4m 54s
Build Assertoor / Build amd64 docker image	38s
Build Assertoor / Build arm64 docker image	1m 48s
Build Assertoor / Build multiarch docker image	12s
Build Assertoor / Build additional docker manifests (master)	17s
Build Assertoor / Build additional docker manifests (master-latest)	12s
Create snapshot release	20s
	12m 58s

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