Log blob count when importing a block via Engine API

[fab-10]

PR description

Log blob count when importing a block via engine API, plus removing an unused method leftover from a previous cleanup

Log lines look like these:

{"@timestamp":"2024-01-25T11:21:32,538","level":"INFO","thread":"vert.x-worker-thread-0","class":"AbstractEngineNewPayload","message":"Imported #10,431,117 / 44 tx / 16 ws / 3 blobs / base fee 11 wei / 4,868,888 (16.2%) gas / (0x79916291a34d7075190b88872c06ee9e89b5350fd04e57b0430c2a6da3620a45) in 0.874s. Peers: 1","throwable":""}
{"@timestamp":"2024-01-25T11:21:33,571","level":"INFO","thread":"vert.x-worker-thread-0","class":"AbstractEngineNewPayload","message":"Imported #10,431,118 / 47 tx / 16 ws / 1 blobs / base fee 11 wei / 8,522,787 (28.4%) gas / (0xec4f4f0f87d4df8bbac2f07a810f46dbb2c7eccef0ae67c3a15aa7ca145d7b25) in 0.904s. Peers: 1","throwable":""}

Fixed Issue(s)

[github-actions]

• I thought about documentation and added the doc-change-required label to this PR if updates are required.
• I thought about the changelog and included a changelog update if required.
• If my PR includes database changes (e.g. KeyValueSegmentIdentifier) I have thought about compatibility and performed forwards and backwards compatibility tests