[Size] Investigate size measurement differences between Apple and Android scenarios

[matouskozak]

There seems to be discrepencies of what we're measuring for Android and Apple in terms of size/extracted size.

For example, for dotnet/runtime sample app:

• Android measuring extracted size https://github.com/dotnet/runtime/blob/6a3a32e2574778edcd9602a468b00c21cc400a57/eng/testing/performance/android_scenarios.proj#L30-L35
• iOS measuring size of zip https://github.com/dotnet/runtime/blob/6a3a32e2574778edcd9602a468b00c21cc400a57/eng/testing/performance/ios_scenarios.proj#L42-L47

For SDK scenario:

• Android seems to be generally bigger than iOS even though it shouldn't be the case (Android AOT should be smaller than iOS FullAOT).

We should aim to unify the measurements to allow comparison between platforms.