[fenix] 1581556: Initialize Glean on the main thread

app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt

@@ -5,9 +5,8 @@
 package org.mozilla.fenix.components.metrics
 
 import android.content.Context
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
+import kotlinx.coroutines.MainScope
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
 import mozilla.components.service.glean.BuildConfig
@@ -397,7 +396,7 @@ class GleanMetricsService(private val context: Context) : MetricsService {
         if (initialized) return
         initialized = true
 
-        starter = CoroutineScope(Dispatchers.IO).launch {
+        starter = MainScope().launch {
             Glean.registerPings(Pings)
             Glean.initialize(context, Configuration(channel = BuildConfig.BUILD_TYPE))