Make logs less verbose, especially for sliding sync (#2825)

* Make logs less verbose, especially for sliding sync.

Use the same config as iOS for most targets.

* Make sure we don't try to upload logs that are larger than the max request size of the bug reporter server.

* Display the loading state as soon as the bug reporter starts processing the log files

* Add changelog

appconfig/src/main/kotlin/io/element/android/appconfig/ApplicationConfig.kt

@@ -40,4 +40,9 @@ object ApplicationConfig {
      * For Element, the value is "Element". We use the same name for desktop and mobile for now.
      */
     const val DESKTOP_APPLICATION_NAME: String = "Element"
+
+    /**
+     * The maximum size of the upload request. Default value is just below CloudFlare's max request size.
+     */
+    const val MAX_LOG_UPLOAD_SIZE = 50 * 1024 * 1024L
 }