Omega Audit Fixes

[zzzuhaibmohd]

This PR addresses the following three issues reported in the Omega audit:

1. Renamed MAX_ACCESS_CRITERIA_ID to MAX_ACCESS_CRITERIA_TYPE for better clarity and alignment with its usage.
2. Removed the redundant use of the unchecked block where no arithmetic operations were involved.
3. Optimized gas usage by simplifying the assignment: lastSeenRoundId = currentProcessingRoundId.
4. set batchSize_ to contributorCount instead of reverting if batchSize_ > contributorCount