Sync lookup dedup range and blobs

[dapplion]

Issue Addressed

Part of

• Block lookup sync technical debt #5549

Proposed Changes

Merges BackFillBlocks, BackFillBlockAndBlobs, RangeBlocks, RangeBlockAndBlobs handling. All those requests return the same type of data, a Vec, which can be handled with an enum request id to differentiate RangeSync from BackfillSync.

Pre-deneb requests of only blocks and post-deneb requests of blocks and blobs can be handled together by tracking if a blobs request has been sent.

This PR does not change any logic or behaviour of either sync, nor their tests. @realbigsean please look into this line change https://github.com/sigp/lighthouse/pull/5561/files#diff-3d6c8081703730f63787240a11f38fdde1d721397245cf316207b108f1df3defR962 to ensure it does not regress this fix #4869

[realbigsean]

@realbigsean please look into this line change https://github.com/sigp/lighthouse/pull/5561/files#diff-3d6c8081703730f63787240a11f38fdde1d721397245cf316207b108f1df3defR962 to ensure it does not regress this fix #4869

looks like the logic there is unchanged 👌

[realbigsean]

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