Fix coroutine scope canceling log spam (DEV) (#2317)

* Clean up log spam for CancellationExceptions.

* Clean up log spam for CancellationExceptions.

* Adjust log level to `error` for flows that completed due to an exception being bubbled up.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/util/device/BackgroundModeStatus.kt

@@ -90,7 +90,10 @@ class BackgroundModeStatus @Inject constructor(
         .onStart { emit(pollisIgnoringBatteryOptimizations()) }
         .distinctUntilChanged()
         .onCompletion {
-            if (it != null) Timber.w(it, "isIgnoringBatteryOptimizations failed.")
+            when {
+                it is CancellationException -> Timber.d("isIgnoringBatteryOptimizations canceled.")
+                it != null -> Timber.e(it, "isIgnoringBatteryOptimizations failed.")
+            }
         }
         .shareLatest(
             tag = "isIgnoringBatteryOptimizations",

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/util/flow/HotDataFlow.kt

 package de.rki.coronawarnapp.util.flow
 
+import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.channels.BufferOverflow
 import kotlinx.coroutines.flow.Flow
@@ -80,8 +81,11 @@ class HotDataFlow<T : Any>(
             }
         }
         .onCompletion { err ->
-            if (err != null) Timber.tag(tag).w(err, "internal onCompletion due to error")
-            else Timber.tag(tag).v("internal onCompletion")
+            when {
+                err is CancellationException -> Timber.tag(tag).d("internal onCompletion due to cancelation")
+                err != null -> Timber.tag(tag).e(err, "internal onCompletion due to error")
+                else -> Timber.tag(tag).v("internal onCompletion")
+            }
         }
         .shareIn(
             scope = scope + coroutineContext,