Disable dev mode on ship builds

[HeyImChris]

Please select one of the following

• I am removing an existing difference between facebook/react-native and microsoft/react-native-macos 👍
• I am making a change required for Microsoft usage of react-native

Summary

Years ago we added in a runtime setting to allow third-party SDX clients to control if they're in debug mode on any builds, regardless of flavor. For the following reasons I'd like to revert this change:

1. Having this diff with FB upstream caused confusion with clients who don't realize we have this macOS repo specific change
2. After 3+ years we have zero clients who have communicated using this feature
3. Debug mode running by accident on ship builds has happened on multiple occasions
4. We've hit ship related crashers to being on debug mode in ship builds by accident

Changelog

[iOS/macOS] [Feature] - Disabling debugging of ship builds

Test Plan

I can no longer launch the debug menu from ship builds in rn-tester

[pull-bot]

Messages

📖

📋 Verify Changelog Format - A changelog entry has the following format: [CATEGORY] [TYPE] - Message. CATEGORY may be: General macOS iOS Android JavaScript Internal (for changes that do not need to be called out in the release notes) TYPE may be: Added, for new features. Changed, for changes in existing functionality. Deprecated, for soon-to-be removed features. Removed, for now removed features. Fixed, for any bug fixes. Security, in case of vulnerabilities. MESSAGE may answer "what and why" on a feature level. Use this to briefly tell React Native users about notable changes.

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[HeyImChris]

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[HeyImChris]

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