Remove JUnit 3 and Junit 4

Only keep JUnit 4 for the flowable-osgi module since the test framework we are using there (PaxExam)
does not support Junit Jupiter and keep it for Flowable 5 for now

Author: filiphr

modules/flowable-app-engine-spring/pom.xml

@@ -57,21 +57,11 @@
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
         </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <scope>provided</scope>
-        </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.junit.vintage</groupId>
-            <artifactId>junit-vintage-engine</artifactId>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>

modules/flowable-app-engine-spring/src/main/java/org/flowable/app/spring/impl/test/SpringFlowableAppTestCase.java

@@ -23,7 +23,6 @@
 import org.flowable.app.api.repository.AppDeployment;
 import org.flowable.app.api.repository.AppDeploymentBuilder;
 import org.flowable.app.engine.AppEngine;
-import org.junit.Before;
 import org.junit.jupiter.api.BeforeEach;
 import org.mockito.Mock;
 import org.springframework.core.io.ByteArrayResource;

modules/flowable-app-engine-spring/src/test/java/org/flowable/app/spring/test/autodeployment/AbstractAutoDeploymentStrategyTest.java

@@ -73,11 +73,6 @@
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
         </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <scope>provided</scope>
-        </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-api</artifactId>
@@ -137,7 +132,6 @@
             org.flowable.app.db.mapping.entity
         </flowable.osgi.export.additional>
         <flowable.osgi.import.additional>
-            junit*;resolution:=optional,
             org.junit*;resolution:=optional,
             com.sun*;resolution:=optional,
             jakarta.activation*;resolution:=optional,