Remove redundant podfile targets

[Saadnajmi]

Please select one of the following

• I am removing an existing difference between facebook/react-native and microsoft/react-native-macos 👍
• I am cherry-picking a change from Facebook's react-native into microsoft/react-native-macos 👍
• I am making a fix / change for the macOS implementation of react-native
• I am making a change required for Microsoft usage of react-native

Summary

These cocoapod targets are a relic of when this repo was closed source. Downstream we have a copy of these targets, and no longer need them in the open source repo

Changelog

[macOS] [Removed] - Remove redundant podfile targets

Test Plan

If this breaks stuff downstream, I'll back it out.

[harrieshin]

"If this breaks stuff downstream, I'll back it out." how will u test it before you merge this pr?

[Saadnajmi]

"If this breaks stuff downstream, I'll back it out." how will u test it before you merge this pr?

I think I can check this downstream with a local yarn resolution + Nuget build. I'll report back...

[Saadnajmi]

Talked offline. This is one of those "This has to be merged to propagate downstream" kinda PRs, so we're just going to merge this now.