Test for PublicNode Sepolia Beaon APIs

[badgersrus]

Why this change is needed

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What changes were made as part of this PR

• Removed duplicate declaration of rollup dups in validate_chain which might be the cause of intermittent failures on full sim
• New unit test for sepolia blob providers but won't reliably pass because of blocks that dont contain blobs
• Better error handling if the API returns empty array
• Allow querying for all blobs in a block without providing the hash

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[tudor-malene]

lgtm

[tudor-malene]

lgtm