chore: remove modular headers hack

[brainbicycle]

This PR resolves PHIRE-1415

Description

Removes the modular headers hack we had in place for firebase compatibility with flipper:

• use the recommended settings described here: https://rnfirebase.io/#altering-cocoapods-to-use-frameworks
• this required some imports to be updated for the new setting
• this caused a build failure in folly, a flag was added as described here: 'folly/experimental/coro/Coroutine.h' file not found after upgrading to > RN 0.74 facebook/folly#2297
• an old static braze lib was linked that had to be removed

PR Checklist

• I have tested my changes on iOS and Android.
• I hid my changes behind a feature flag, or they don't need one.
• I have included screenshots or videos, or I have not changed the UI.
• I have added tests, or my changes don't require any.
• I added an app state migration, or my changes do not require one.
• I have documented any follow-up work that this PR will require, or it does not require any.
• I have added a changelog entry below, or my changes do not require one.

To the reviewers 👀

• I would like at least one of the reviewers to run this PR on the simulator or device.

Changelog updates

Changelog updates

Cross-platform user-facing changes

iOS user-facing changes

Android user-facing changes

Dev changes

• remove modular headers hack and use recommended firebase settings - brian

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[ArtsyOpenSource]

This PR contains the following changes:

• Dev changes (remove modular headers hack and use recommended firebase settings - brian - brainbicycle)

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