Improve Warp Sync Logging

[runcomet]

Resolves #6747

This PR enhances warp sync progress reporting by:

• Removing irrelevant data: Eliminates the misleading best and finalized block numbers that remain at #0 during warp sync.

• Adding meaningful progress tracking: Shows the number of eras verified using proof.proofs.len() as u64 to give users clear progress indication.

• Updating log format: Changes from confusing static data to dynamic progress like "15 eras synced, 2.45 MiB"

[runcomet]

pls review @bkchr

[bkchr]

Sorry for the delay

[bkchr]

Some last nitpicks, otherwise looks good to me.

[bkchr]

@runcomet please also add a prdoc

[runcomet]

pls review @bkchr

in display.rs I added similar spacing as seen for Downloading and Importing SyncState

let progress_text = if let Some(ref status) = warp.status {
    format!(" {}, {:.2} Mib", status, total_mib)
} else {
    format!(" {:.2} Mib", total_mib)
};

[runcomet]

Suggestions have been implemented, please review @skunert @michalkucharczyk