Remove Mock Mempool #10655

Job	Run time
Unit (macos-14)	3m 54s
Unit (ubuntu-20.04)	3m 27s
Unit (ubuntu-22.04)	3m 22s
e2e	13m 55s
e2e_existing_network	5m 7s
Unit (ubuntu-24.04)	7m 26s
Protobuf Lint	7s
Unit (windows-2022)	9m 52s
Unit (custom-arm64-jammy)	5m 39s
Fuzz	14m 59s
Unit (custom-arm64-noble)	5m 36s
Lint	3m 36s
Upgrade	3m 23s
Up-to-date protobuf	19s
Run bootstrap monitor e2e tests	6m 21s
Up-to-date mocks	2m 27s
Up-to-date go.mod and go.sum	23s
Build Antithesis avalanchego images	9m 39s
Build Antithesis xsvm images	12m 41s
Image build	10m 55s
	2h 3m 8s

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