Improve BlocksByRangeMessage validation

[tbenr]

Apply what we already did for BlobSidecars

Documentation

• I thought about documentation and added the doc-change-required label to this PR if updates are required.

Changelog

• I thought about adding a changelog entry, and added one if I deemed necessary.

[mehdi-aouadi]

LGTM
I'd suggest adding a test though

[tbenr]

@mehdi-aouadi
I realized I wasn't addressing the actual problem we saw on devnet

2025-02-03 17:38:19.009 ERROR - Unhandled error while processing request /eth2/beacon_chain/req/beacon_blocks_by_range/2/ssz_snappy
java.lang.ArithmeticException: uint64 overflow
at tech.pegasys.teku.infrastructure.unsigned.UInt64.plus(UInt64.java:142) ~[teku-infrastructure-unsigned-develop.jar:UNKNOWN+g96c73da]
at tech.pegasys.teku.infrastructure.unsigned.UInt64.plus(UInt64.java:137) ~[teku-infrastructure-unsigned-develop.jar:UNKNOWN+g96c73da]
at tech.pegasys.teku.spec.datastructures.networking.libp2p.rpc.BeaconBlocksByRangeRequestMessage.getMaxSlot(BeaconBlocksByRangeRequestMessage.java:70) ~[teku-ethereum-spec-develop.jar:UNKNOWN+g96c73da]
at tech.pegasys.teku.networking.eth2.rpc.beaconchain.methods.BeaconBlocksByRangeMessageHandler.validateRequest(BeaconBlocksByRangeMessageHandler.java:84) ~[teku-networking-eth2-develop.jar:UNKNOWN+g96c73da]
at tech.pegasys.teku.networking.eth2.rpc.beaconchain.methods.BeaconBlocksByRangeMessageHandler.validateRequest(BeaconBlocksByRangeMessageHandler.java:51) ~[teku-networking-eth2-develop.jar:UNKNOWN+g96c73da]

addressed now, and added 2 tests

[mehdi-aouadi]

LGTM