[CASSANDRA-18999][5.0] Gossiper::hasMajorVersion3Nodes returns true when a cluster is upgrading patch version without Cassandra 3 nodes. #3004
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Per the conversation in CASSANDRA-18999, this PR removes
Gossiper#hasMajorVersion3Nodes
for Cassandra 5.0 as we do not support upgrades from 3.x -> 5.0. This PR also removes all references toGossiper#hasMajorVersion3Nodes
and cleans up any additional dead code that this creates (mostly that inEndpointState
).