This referenda increases the parachain validator set size from 500 to 600.
The maximum backing group size is kept to 5, so the total number of usable cores increases to 120.

Additionally, also update the setNDelayTranches from 89 to 257, which will reduce the number of assignments per candidate per delay tranche from ~5.61 to ~2.33, the justification why this is the desired value for this parameter can be found in ELVES https://eprint.iacr.org/2024/961 paper and here https://github.com/paritytech/polkadot-sdk/issues/6853#issuecomment-2540373492.


- **Problem Statement:** Increasing the parachain validator set size from 500 to 600 and updating setNDelayTranches from 89 to 257.
- **Significance:** Enhancing network capacity and efficiency by accommodating more validators and reducing assignments per candidate per delay tranche.
- **Proposed Solution:** Increase parachain validator set size to 600 and update setNDelayTranches to 257.
- **Expected Outcomes:** Improved network scalability and performance with a larger validator set and reduced assignments per candidate per delay tranche.

#484 [Whitelisted Caller] Increase max_validators to 600

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