feat(mobile): use shared native client (#25942)

* use shared client in dart

fix android

* websocket integration

platform-side headers

update comment

consistent platform check

tweak websocket handling

support streaming

* redundant logging

* fix proguard

* formatting

* handle onProgress

* support videos on ios

* inline return

* improved ios impl

* cleanup

* sync stopForegroundBackup

* voidify

* future already completed

* stream request on android

* outdated ios ws code

* use `choosePrivateKeyAlias`

* return result

* formatting

* update tests

* redundant check

* handle custom headers

* move completer outside of state

* persist auth

* dispose old socket

* use group id for cookies

* redundant headers

* cache global ref

* handle network switching

* handle basic auth

* apply custom headers immediately

* video player update

* fix

* persist url

* potential logout fix

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/ios/Runner/Images/RemoteImagesImpl.swift

@@ -33,12 +33,9 @@ class RemoteImageApiImpl: NSObject, RemoteImageApi {
     kCGImageSourceCreateThumbnailFromImageAlways: true
   ] as CFDictionary
 
-  func requestImage(url: String, headers: [String : String], requestId: Int64, preferEncoded: Bool, completion: @escaping (Result<[String : Int64]?, any Error>) -> Void) {
+  func requestImage(url: String, requestId: Int64, preferEncoded: Bool, completion: @escaping (Result<[String : Int64]?, any Error>) -> Void) {
     var urlRequest = URLRequest(url: URL(string: url)!)
     urlRequest.cachePolicy = .returnCacheDataElseLoad
-    for (key, value) in headers {
-      urlRequest.setValue(value, forHTTPHeaderField: key)
-    }
 
     let task = URLSessionManager.shared.session.dataTask(with: urlRequest) { data, response, error in
       Self.handleCompletion(requestId: requestId, encoded: preferEncoded, data: data, response: response, error: error)