`redundant_sendable` should not apply to protocols

[riley-williams]

Bug Description

Sendable constraints on global-actor-qualified protocols are not redundant.

// This triggers a violation:
@MainActor protocol MyProtocol: Sendable { }

Minimal example showing Sendable is not inferred:

@MainActor protocol NotSend { }

struct S<P: NotSend>: Sendable {
    var p: P // Stored property 'p' of 'Sendable'-conforming generic struct 'S' has non-sendable type 'P'
}

Environment

• SwiftLint 0.58.0
• Xcode 16.2