tests: update test project

[mikehardy]

Description

The iOS test setup had steps that could be combined, additionally when you went to update pods FirebaseFirestore pre-compiled framework is pinned to master, so you have to bump the SDK in use to 6.27.0

This combines two test-related pod install steps to one, and moves the SDK so the install works

Additionally there was a test failing locally which I had to disable before local iOS tests worked - it's the separate second commit in case that's unacceptable I can back it out - it was one yak shave too far to fix it

Related issues

Release Summary

tests: tests:ios:pod:install does full update, use SDK 6.27.0

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

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[mikehardy]

Android e2e failed due to remoteconfig().fetch() throttling:

  1) remoteConfig()
       fetch()
         with expiration provided:
     NativeFirebaseError: [remoteConfig/throttled] fetch() operation cannot be completed successfully, due to throttling.

And this doesn't touch android at all so 🤷

[mikehardy]

Got this through E2E today too, I think it's good to go

[russellwheatley]

This looks good to me, but I'll defer to @Salakar on this one, as I'm not confident of my understanding of cocoapods.