Merge two kotlin-related version properties, no need for the split

Author: jmartisk

client/model-builder/pom.xml

@@ -70,7 +70,7 @@
             <plugin>
                 <artifactId>kotlin-maven-plugin</artifactId>
                 <groupId>org.jetbrains.kotlin</groupId>
-                <version>${version.kotlin.compiler}</version>
+                <version>${version.kotlin}</version>
                 <executions>
                     <execution>
                         <id>test-compile</id>
@@ -98,7 +98,7 @@
                     <dependency>
                         <groupId>org.jetbrains.kotlin</groupId>
                         <artifactId>kotlin-maven-allopen</artifactId>
-                        <version>${version.kotlin.compiler}</version>
+                        <version>${version.kotlin}</version>
                     </dependency>
                 </dependencies>
             </plugin>

common/schema-builder/pom.xml

@@ -99,7 +99,7 @@
             <plugin>
                 <groupId>org.jetbrains.kotlin</groupId>
                 <artifactId>kotlin-maven-plugin</artifactId>
-                <version>${version.kotlin.compiler}</version>
+                <version>${version.kotlin}</version>
                 <executions>
                     <execution>
                         <id>test-compile</id>

pom.xml

@@ -62,7 +62,6 @@
         <maven.compiler.target>17</maven.compiler.target>
         <version.kotlin>2.3.20</version.kotlin>
         <version.impsort.plugin>1.13.0</version.impsort.plugin>
-        <version.kotlin.compiler>2.3.21</version.kotlin.compiler>
         <version.maven-dependency-plugin>3.10.0</version.maven-dependency-plugin>
 
     </properties>