BAEL-5246: pom cleanup (#4620)

* BAEL-5246: round 1 of pom cleanup - upto "jersey" project

* BAEL-5246: Initial pass for pom cleanup - upto spring-cloud

* BAEL-5246: pom cleanup upto testing-modules/junit5

* BAEL-5246: pom cleanup - upto xstream

* BAEL-5246: pom cleanup - last round (before review)

core-kotlin/pom.xml

@@ -143,8 +143,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>${maven-compiler-plugin.version}</version>
                 <configuration>
-                    <source>${maven.compiler.source}</source>
-                    <target>${maven.compiler.target}</target>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
                 </configuration>
                 <executions>
                     <!-- Replacing default-compile as it is treated specially 
@@ -204,7 +204,6 @@
     </build>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <kotlin-maven-plugin.version>1.2.41</kotlin-maven-plugin.version>
         <kotlin-test-junit.version>1.2.41</kotlin-test-junit.version>
         <kotlin-stdlib.version>1.2.41</kotlin-stdlib.version>
@@ -213,16 +212,11 @@
         <mockito-kotlin.version>1.5.0</mockito-kotlin.version>
         <kodein.version>4.1.0</kodein.version>
         <klaxon.version>3.0.4</klaxon.version>
-        <maven-failsafe-plugin.version>2.21.0</maven-failsafe-plugin.version>
         <khttp.version>0.1.0</khttp.version>
         <commons-math3.version>3.6.1</commons-math3.version>
-        <junit.jupiter.version>5.2.0</junit.jupiter.version>
         <junit.platform.version>1.2.0</junit.platform.version>
         <junit.vintage.version>5.2.0</junit.vintage.version>
-        <junit4.version>4.12</junit4.version>
         <assertj.version>3.10.0</assertj.version>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
     </properties>
 
 </project>