Use generated ID for the background session. (#1528)

Session ID should be unique across the application. This is not the
case when there are several network layers instances.
Not the best but fast and easy way is to generate the ID using
existing mechanism.

Relates-To: OCMAM-97

Signed-off-by: Rustam Gamidov <ext-rustam.gamidov@here.com>

Author: rustam-gamidov-here

olp-cpp-sdk-core/src/http/ios/OLPHttpClient.mm

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2019-2023 HERE Europe B.V.
+ * Copyright (C) 2019-2024 HERE Europe B.V.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -93,7 +93,7 @@ - (instancetype)init {
     _sharedUrlBackgroundSession =
         [self urlSessionWithProxy:nil
                        andHeaders:nil
-                  andBackgroundId:@"olp-sdk-cpp-core"];
+                  andBackgroundId:[self generateNextSessionId]];
 
     _tasks = [[NSMutableDictionary alloc] init];
     _idTaskMap = [[NSMutableDictionary alloc] init];