Clean up record_projects_target_platforms feature flag

What does this MR do and why?

Remove and clean up usages of feature flag for detecting if a project targets Apple iOS platform: :record_projects_target_platforms

Related to #390293 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.