Upsert Compaction: CRC mismatch robustness

[tibrewalpratik17]

This issue of CRC mismatches across replicas for a segment has been discussed multiple times (#12396, #11004). I'm creating this parent issue to track how these mismatches affect the Upsert compaction flow overall. While eliminating CRC mismatches entirely would be ideal, until we find the best solution for that, we can focus on making the Upsert compaction flow robust enough to handle such mismatches.

• Upsert Compaction Generator: CRC mismatch robustness #13492
• Upsert Compaction Executor: CRC mismatch robustness #13491
• Upsert Compaction: Schema / Index updates #13494

[hpvd]

you could add new parent-issue label