fix: log nil bridge before addUIBlock in New Architecture

[jamesnrokt]

Summary

• Adds a nil-guard log in RNMPRokt.mm before the addUIBlock: call that wraps selectPlacements
• When self.bridge or self.bridge.uiManager is nil — silently swallowing the entire selectPlacements call in New Architecture bridgeless production builds — an NSLog now surfaces this in device logs
• No behaviour change; the message-to-nil on addUIBlock: still occurs naturally, but the failure is now visible

Testing Plan

• Build a New Architecture production/CI IPA and run on a physical device; the log should appear when bridgeless mode causes self.bridge to be nil
• Verify no regression in Simulator or Xcode debug builds where self.bridge is non-nil (log should not fire)

Master Issue

Closes https://go.mparticle.com/work/REPLACEME

[Copilot]

Pull request overview

Adds a device-visible log when self.bridge / self.bridge.uiManager is nil before addUIBlock:, making a previously silent no-op in New Architecture bridgeless production builds observable.

Changes:

• Adds a conditional log when self.bridge or self.bridge.uiManager is nil prior to addUIBlock:

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