[yugabyte#9301] Default to logging DEBUG logs on stdout

Summary: application.log files for Platform have full DEBUG logs but we do not log these to stdout for a better developer experience. However, stdout logs are consumed by kubernetes and docker containers, so we should default to DEBUG logs on stdout and let developers customize the level for themselves.

Test Plan: sbt run, verify that DEBUG logs can be seen on stdout

Reviewers: wesley, jvigil

Reviewed By: jvigil

Subscribers: jenkins-bot, yugaware

Differential Revision: https://phabricator.dev.yugabyte.com/D12274

Author: iSignal

managed/src/main/resources/logback.xml

@@ -23,7 +23,7 @@
       <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5coloredLevel %F:%L [%thread] %msg%n</pattern>
     </encoder>
     <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
-      <level>${APPLICATION_CONSOLE_LOG_LEVEL:-INFO}</level>
+      <level>${APPLICATION_CONSOLE_LOG_LEVEL:-DEBUG}</level>
     </filter>
   </appender>