Registry dependency resolution no longer breaks on duplicate manifest variants

When resolving packages through the Tuist registry, tuist install no longer fails with SwiftPM errors like duplicate key found: 'Package@swift-6.0.0.swift'. The registry now removes redundant alternate manifests whose Swift tools version is equivalent to the default Package.swift (for example, versions written as 6.0 vs 6.0.0), so fresh worktrees and CLI builds can resolve dependencies without manual workarounds.