chore(deps): Remove unused mobile-logstash-encoder

https://github.com/guardian/mobile-logstash-encoder hydrates logs with Stack, Stage, App markers
before writing to Kinesis.

This functionality is now covered by https://github.com/guardian/devx-logs so we can remove the dependency.

Author: akash1810

.scala-steward.conf

@@ -32,7 +32,4 @@ updates.pin = [
 
  # Pin Play framework to 2.9 until we've migrated the code from Akka to Pekko
   { groupId = "com.typesafe.play", artifactId = "sbt-plugin", version = "2.9.1" },
-
- # Pin logstash to 1.8 until we have bumped simple-configuration
-   { groupId = "com.gu", artifactId = "mobile-logstash-encoder", version = "1.1.8" },
 ]

build.sbt

@@ -118,11 +118,11 @@ lazy val common = project
       "org.tpolecat" %% "doobie-specs2"    % doobieVersion % Test,
       "org.tpolecat" %% "doobie-scalatest" % doobieVersion % Test,
       "org.tpolecat" %% "doobie-h2"        % doobieVersion % Test,
-      "com.gu" %% "mobile-logstash-encoder" % "1.1.8",
       "com.gu" %% "simple-configuration-ssm" % simpleConfigurationVersion,
       "org.postgresql" % "postgresql" % "42.7.7",
       "ch.qos.logback" % "logback-core" % logbackVersion,
       "ch.qos.logback" % "logback-classic" % logbackVersion,
+      "net.logstash.logback" % "logstash-logback-encoder" % "8.1"
     ),
     fork := true,
     startDynamoDBLocal := startDynamoDBLocal.dependsOn(Test / compile).value,

notification/conf/logback.xml

@@ -10,9 +10,7 @@
       <maxHistory>30</maxHistory>
     </rollingPolicy>
 
-    <encoder class="com.gu.mobile.logback.MobileLogstashEncoder">
-      <defaultAppName>notifications</defaultAppName>
-    </encoder>
+    <encoder class="net.logstash.logback.encoder.LogstashEncoder" />
   </appender>
 
   <appender name="ASYNCFILE" class="ch.qos.logback.classic.AsyncAppender">

registration/conf/logback.xml

@@ -10,9 +10,7 @@
       <maxHistory>30</maxHistory>
     </rollingPolicy>
 
-    <encoder class="com.gu.mobile.logback.MobileLogstashEncoder">
-      <defaultAppName>notifications</defaultAppName>
-    </encoder>
+    <encoder class="net.logstash.logback.encoder.LogstashEncoder" />
   </appender>
 
   <appender name="ASYNCFILE" class="ch.qos.logback.classic.AsyncAppender">

report/conf/logback.xml

@@ -12,9 +12,7 @@
             <maxHistory>30</maxHistory>
         </rollingPolicy>
 
-        <encoder class="com.gu.mobile.logback.MobileLogstashEncoder">
-            <defaultAppName>notifications</defaultAppName>
-        </encoder>
+        <encoder class="net.logstash.logback.encoder.LogstashEncoder" />
     </appender>
 
     <appender name="ASYNCFILE" class="ch.qos.logback.classic.AsyncAppender">