Separate `ios_test` job

[kg-currenxie]

What would you like to be added

Add a separate ios_test job, like Android

Why is it together with ios_build_and_test? 🤔

Why is this needed

Mostly for the CI hooks for github, they list each job separately, and we would know what failed; the build or the test.

[compojoom]

I was also actually thinking about this. We have some flacky tests. Our test suite takes 20mins to run. Build takes 10mins. If a test fails we often just restart the step to see if the test will again fail. If the steps are separate this will save 10mins of build time. On the other hand it would also add few several minutes for machine startup, yarn install etc. So not 100% sure that it will actually help as most of the times we would be adding time instead of saving time.