feat: Remove legacy ObjC schemes

[ncooke3]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @ncooke3, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request undertakes a substantial cleanup effort across several example projects, including InAppMessaging, Installations, Messaging, and Performance. The core purpose is to eliminate all remnants of legacy Objective-C schemes and their associated files and configurations. By removing outdated Objective-C targets, source files, and build settings, the PR modernizes the project setup, reduces complexity, and ensures that the examples are aligned with current Swift-first development practices. This change simplifies future maintenance and development within these example applications.

Highlights

• Objective-C Scheme Removal: All legacy Objective-C schemes and their associated configurations have been completely removed from the InAppMessaging, Installations, Messaging, and Performance example projects.
• File Deletion: Numerous Objective-C source files (.h, .m), storyboards, Info.plist files, and test targets specific to the Objective-C implementations have been deleted across the example directories.
• Project Streamlining: The Xcode project files (project.pbxproj) for these examples have been significantly cleaned up, removing references to the deleted Objective-C components, leading to a more streamlined and maintainable project structure focused on Swift.

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[gemini-code-assist]

Code Review

This pull request is a great cleanup effort, removing a significant amount of legacy Objective-C code, schemes, and project configurations across several example projects. The changes make the projects much cleaner and easier to maintain. I've found one minor point of follow-up to make the cleanup even more complete, but overall this is a solid improvement.