Analysis: Resolve global scope delicate coroutines api warnings

Warning Message: "This is a delicate API and its use requires care.
Make sure you fully read and understand documentation of the declaration
that is marked as a delicate API."

Adding the '@OptIn(DelicateCoroutinesApi::class)' annotation for the
'retrieveCapability(...)' function is the recommended action to resolve
this 'GlobalScope' warning.

Author: ParaskP7

WordPress/src/main/java/org/wordpress/android/ui/posts/editor/XPostsCapabilityChecker.kt

@@ -1,6 +1,7 @@
 package org.wordpress.android.ui.posts.editor
 
 import androidx.core.util.Consumer
+import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
@@ -13,6 +14,7 @@ class XPostsCapabilityChecker @Inject constructor(
     private val xPostsStore: XPostsStore
 ) {
     @Suppress("GlobalCoroutineUsage")
+    @OptIn(DelicateCoroutinesApi::class)
     fun retrieveCapability(site: SiteModel, callback: Consumer<Boolean>) {
         GlobalScope.launch(Dispatchers.IO) {
             val capability = isCapable(site)