refactor: simplify user agent processing in DeviceInfo

- Remove manual queue processing triggers after unlocking user agent string lock
- Update comments to clarify that modern queue processes automatically after unlock
- Streamline the code for better readability and maintainability as part of ongoing SDK modernization efforts

Author: wpinho-branch

Branch-SDK/src/main/java/io/branch/referral/DeviceInfo.java

@@ -250,7 +250,7 @@ private void setPostUserAgent(final JSONObject userDataObj) {
                 userDataObj.put(Defines.Jsonkey.UserAgent.getKey(), Branch._userAgentString);
 
                 Branch.getInstance().requestQueue_.unlockProcessWait(ServerRequest.PROCESS_WAIT_LOCK.USER_AGENT_STRING_LOCK);
-                Branch.getInstance().requestQueue_.processNextQueueItem("setPostUserAgent");
+                // Modern queue processes automatically after unlock - no manual trigger needed
             }
             else if (Branch.userAgentSync) {
                 // If user agent sync is false, then the async coroutine is executed instead but may not have finished yet.
@@ -277,7 +277,7 @@ public void resumeWith(@NonNull Object o) {
                         }
 
                         Branch.getInstance().requestQueue_.unlockProcessWait(ServerRequest.PROCESS_WAIT_LOCK.USER_AGENT_STRING_LOCK);
-                        Branch.getInstance().requestQueue_.processNextQueueItem("onUserAgentStringFetchFinished");
+                        // Modern queue processes automatically after unlock - no manual trigger needed
                     }
                 });
             }
@@ -305,15 +305,15 @@ public void resumeWith(@NonNull Object o) {
                         }
 
                         Branch.getInstance().requestQueue_.unlockProcessWait(ServerRequest.PROCESS_WAIT_LOCK.USER_AGENT_STRING_LOCK);
-                        Branch.getInstance().requestQueue_.processNextQueueItem("getUserAgentAsync resumeWith");
+                        // Modern queue processes automatically after unlock - no manual trigger needed
                     }
                 });
             }
         }
         catch (Exception exception){
             BranchLogger.w("Caught exception trying to set userAgent " + exception.getMessage());
             Branch.getInstance().requestQueue_.unlockProcessWait(ServerRequest.PROCESS_WAIT_LOCK.USER_AGENT_STRING_LOCK);
-            Branch.getInstance().requestQueue_.processNextQueueItem("getUserAgentAsync");
+            // Modern queue processes automatically after unlock - no manual trigger needed
         }
     }