fix(remote-config)!: fetchAndActivate API & activate API update

[russellwheatley]

Description

Updated iOS to match Android & Web. Updated types as well as documentation.

Web documentation & Android documentation indicate:

• fetchAndActivate - should return false when local config values are up to date with backend config values.
• activate - should return false when all local config values are already activated.

Related issues

fixes #2767

Release Summary

• fetchAndActivate

  • Previous behaviour returned a boolean indicating if config values were activated
  • New behaviour returns a boolean indicating if any config values were fetched remotely.

• activate

  • Previous behaviour returned a boolean indicating if config values were activated
  • New behaviour returns a boolean indicating if any local config values were activated.

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

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[Salakar]

That wasn't merged as a breaking change on master, also missing the commit message body describing the breaking behaviour: #4157 (comment)

[Salakar]

Not much we can do about it now but could update the changelog manually after its released I think

[mikehardy]

I'll do a quick PR to remote-config that is just for breaking / release notes auto-goodness, I want the version number to bump correctly it's not just a release notes deal. Small break but still