Fix compile errors in Combine (#11610)

#11231 introduces some renamed methods, which broke the Combine build, see this workflow run: firebase/firebase-ios-sdk/actions/runs/5665691823

This PR should fix this.

Author: peterfriese

FirebaseCombineSwift/Tests/Unit/Auth/AuthMocks.swift

@@ -104,12 +104,17 @@ extension AuthBackendImplementationMock {
     fatalError("You need to implement \(#function) in your mock.")
   }
 
+  func getRecaptchaConfig(_ request: FIRGetRecaptchaConfigRequest,
+                          callback: @escaping FIRGetRecaptchaConfigResponseCallback) {
+    fatalError("You need to implement \(#function) in your mock.")
+  }
+
   func resetPassword(_ request: FIRResetPasswordRequest,
                      callback: @escaping FIRResetPasswordCallback) {
     fatalError("You need to implement \(#function) in your mock.")
   }
 
-  func post(with request: FIRAuthRPCRequest, response: FIRAuthRPCResponse,
+  func call(with request: FIRAuthRPCRequest, response: FIRAuthRPCResponse,
             callback: @escaping (Error?) -> Void) {
     fatalError("You need to implement \(#function) in your mock.")
   }

FirebaseCombineSwift/Tests/Unit/Auth/SignInWithGameCenterTests.swift

@@ -69,7 +69,7 @@ class SignInWithGameCenterTests: XCTestCase {
     var contentType: String?
     var handler: FIRAuthBackendRPCIssuerCompletionHandler?
 
-    func asyncPostToURL(with requestConfiguration: FIRAuthRequestConfiguration, url URL: URL,
+    func asyncCallToURL(with requestConfiguration: FIRAuthRequestConfiguration, url URL: URL,
                         body: Data?, contentType: String,
                         completionHandler handler: @escaping FIRAuthBackendRPCIssuerCompletionHandler) {
       requestURL = URL

FirebaseCombineSwift/Tests/Unit/FirebaseCombine-unit-Bridging-Header.h

@@ -42,6 +42,8 @@
 #import "FirebaseAuth/Sources/Backend/RPC/FIRGetOOBConfirmationCodeResponse.h"
 #import "FirebaseAuth/Sources/Backend/RPC/FIRGetProjectConfigRequest.h"
 #import "FirebaseAuth/Sources/Backend/RPC/FIRGetProjectConfigResponse.h"
+#import "FirebaseAuth/Sources/Backend/RPC/FIRGetRecaptchaConfigRequest.h"
+#import "FirebaseAuth/Sources/Backend/RPC/FIRGetRecaptchaConfigResponse.h"
 #import "FirebaseAuth/Sources/Backend/RPC/FIRResetPasswordRequest.h"
 #import "FirebaseAuth/Sources/Backend/RPC/FIRResetPasswordResponse.h"
 #import "FirebaseAuth/Sources/Backend/RPC/FIRRevokeTokenRequest.h"