chore: Remove V9 SDK API scripts and fixed project references

[github-actions]

Note

The pull request "chore: Remove V9 SDK API scripts and fixed project references" was created by @philprime but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

• Removes the sdk_api_v9.json which is not needed on the v8.x branch anymore
• Removes broken references in the Xcode project.

#skip-changelog

[linear]

COCOA-1105