[React Native] Canonicalize LogLevel to debug/warn/error/none

[markmur]

What

Brings React Native in line with the other platforms' canonical, ordered LogLevel set: debug, warn, error, none.

• Expands the JS LogLevel enum from {debug, error} to the full four-value set.
• Forwards all four values across the iOS and Android bridges.
• Drops the iOS .all reference (removed from the Swift SDK) and makes both bridge log-level mappings exhaustive.
• Default log level is now warn (was error), aligning RN with Swift, Android, and Web. Unrecognised values from the native bridge coerce to warn.

Threshold

LogLevel	debug	warn	error
debug	✅	✅	✅
warn (default)	–	✅	✅
error	–	–	✅
none	–	–	–

Usage

import {ShopifyCheckout, LogLevel} from '@shopify/checkout-kit-react-native';

const checkout = new ShopifyCheckout(url, {
  logLevel: LogLevel.debug, // debug + warnings + errors
});

checkout.setConfig({logLevel: LogLevel.none}); // silence everything

Validating locally

This PR depends on the unreleased native SDK changes in the stack (Swift #441, Android #442). The React Native --local / Maven Local workflow must publish those native SDKs first before the iOS/Android bridges resolve:

# Android: publishes the local Android SDK + Kotlin protocol to Maven Local, then runs RN tests
dev rn test android

# iOS sample against local platforms/swift sources
dev rn ios --local

Note: RN Android --local currently surfaces a pre-existing Configuration.colorScheme API gap between the RN bridge and the unreleased in-repo Android SDK (which uses appearance/sheet). That drift is unrelated to this change and is not addressed here. The JS suite (including the new coerceConfigurationResult log-level coverage) is fully green.

[markmur]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• [React Native] Canonicalize LogLevel to debug/warn/error/none #444 👈 (View in Graphite)
• [Web] Add log-level attribute for console verbosity #443
• [Android] Add NONE log level #442
• [Swift] Canonicalize LogLevel to debug/warn/error/none #441
• [Kotlin] Move Client to protocol #438
• Add decode logging parity for Web + Swift + Android #437
• main

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