Replace USE_ROCKSDB_LOG_STATE and WITH_ROCKSDB_CLOUD with WITH_LOG_STATE

[githubzilla]

Summary by CodeRabbit

• New Features

  • Adds a unified log-state option set (MEMORY, ROCKSDB, ROCKSDB_CLOUD_S3, ROCKSDB_CLOUD_GCS) and introduces GCS cloud backend alongside S3 and local RocksDB.

• Documentation

  • Build docs updated to show the new WITH_LOG_STATE environment/CMake usage and examples.

• Chores

  • Build scripts and discovery flows switched to WITH_LOG_STATE; env/flag naming, messaging, and packaging scripts standardized; module pointers updated.