Analysis: Suppress synchronized on suspend coroutines warning

Warning Messages: "@synchronized annotation is not applicable to suspend
functions and lambdas"

This coroutines warning is suppressed, that is, instead of it being
resolved, since it seems that:
1. Adding the '@synchronized' annotation was done deliberately, and
2. Changing that is a bit complicated as it would need a bit more
thought to properly fix this, using [Mutex] or otherwise.

For more info see:
- Fix crash in UploadStarter on Samsung devices with Android 5 #10878
(Introduced In): https://github.com/wordpress-mobile/WordPress-Android/
pull/10878
- Forbid @synchronized annotation on suspend functions (Kotlin Issue):
https://youtrack.jetbrains.com/issue/KT-27333/
Forbid-Synchronized-annotation-on-suspend-functions
- Coroutines and Java Synchronization Don't Mix (Blog Post:
https://blog.danlew.net/2020/01/28/
coroutines-and-java-synchronization-dont-mix/

Author: ParaskP7

WordPress/src/main/java/org/wordpress/android/ui/uploads/UploadStarter.kt

@@ -142,6 +142,7 @@ class UploadStarter @Inject constructor(
      * and `uploadServiceFacade.isPostUploadingOrQueued(it)` might return out-of-date result and a same post is added
      * twice.
      */
+    @Suppress("SYNCHRONIZED_ON_SUSPEND")
     @Synchronized
     private suspend fun upload(site: SiteModel) = coroutineScope {
         val posts = async { postStore.getPostsWithLocalChanges(site) }