Cleanup the detect_android_projects

What does this MR do and why?

This issue is to cleanup the detect_android_projects feature flag. As per @eugielimpin

Unfortunately, this experiment was never turned on.

And we have no plans to turn this experiment on in the near future. We should remove all related code.

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.

Related to #398664 (closed)