fix replicator to process skipped blocks

[PikaZ76]

What changed? Why?

handle skipped Solana slots correctly

Solana skipped slots are now explicitly handled in the replicator workflow.
Previously, attempting to process skipped blocks caused download failures
because they lack a file URL and blob data.

This change:

• Short-circuits processing for blocks marked Skipped or with missing FileUrl.
• Persists placeholder metadata (Tag/Height/Skipped/etc.) for these slots instead
  of attempting downloads, ensuring continuity in meta storage.

Fixes replicator workflow failures on Solana mainnet skipped slots.

How did you test the change?

• unit test
• integration test
• functional test
• adhoc test (described below)

[gemini-code-assist]

Summary of Changes

Hello @PikaZ76, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the replicator's behavior when processing blocks, specifically addressing scenarios where blocks are intentionally skipped or have incomplete data. The primary goal is to ensure that the replicator can account for these blocks by storing their essential metadata, rather than failing on download attempts. This change enhances the system's resilience and provides clearer insights into block processing outcomes.

Highlights

• Skipped Block Processing: The replicator now explicitly checks for blocks marked as 'skipped' and, when found, it processes them by storing only their metadata without attempting to download the actual block data.
• Missing URL Handling: Added logic to handle cases where a block file's URL is missing. Similar to skipped blocks, the replicator will now log a warning, store the block's metadata, and skip the download.
• Improved Error Logging: Error messages for failed block file downloads now include the URL of the file that could not be downloaded, which will aid in debugging.

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[gemini-code-assist]

Code Review

This pull request correctly implements the handling of skipped blocks in the replicator by avoiding the download and only storing metadata. The improved error logging for download failures is also a good addition. I've included one suggestion to refactor some duplicated code to improve maintainability.