* Mark ObjC typedefs as unavailable in Swift.
This is part of the larger Swift API improvements effort. These reduce
visibility in autocomplete, and we've mostly migrated away from them
already. This hides the unused type from the API surface to avoid
cluttering the list of types avialable.
* Revert FDL Test
* Fix CombineSwift tests
* Fixed Firestore tests
* Revert unneeded changes for FDL internal headers.
Ryan Wilson