fix: prevent action crashes and reduce SOCKS5 save churn

[Timo972]

Summary

• make request-description redaction accept top-level JSON arrays, preventing /mobilerun/actions tap and swipe requests from crashing on keyed subscripting
• reuse an unchanged, enabled, disconnected NETunnelProviderManager configuration instead of calling saveToPreferences on every connect
• explain the UDP ASSOCIATE requirement when plain socks5:// startup is rejected and recommend socks5h:// for TCP-only proxies
• add regression coverage for array request bodies, configuration comparison, and local-DNS diagnostics

Validation

• xcodebuild test -project WebDriverAgent.xcodeproj -scheme WebDriverAgentLib -destination 'platform=iOS Simulator,id=72A3381E-2F17-4D03-B6A2-4CB64B8DA86A' -only-testing:UnitTests CODE_SIGNING_ALLOWED=NO — 241 tests passed, 1 skipped
• WebDriverAgentRunnerTunnel generic iOS device build passed
• WebDriverAgentLib_watchOS generic watchOS build passed
• WebDriverAgentLib_tvOS device target build passed

Runtime note

The repeated 30–40 connect/disconnect cycle scenario was not rerun after this change because the available physical iPhones were offline. The patch removes redundant preference saves for unchanged configurations; configurations that actually change still persist normally.