JerseyTest is not compatible with JUnit 5

[jbescos]

Relates to issue #3662

This PR allows to run tests with JUnit5. The methods JerseyTest#setUp and JerseyTest#tearDown are invoked in the same way they are with JUnit4. Then, no NullPointerException is thrown.

This PR is unrelated to JUnit5 extensions.

Dependency tree of the test module (junit4 is not a dependency):

[INFO] --- maven-dependency-plugin:3.1.2:tree (default-cli) @ jersey-3662 ---
[INFO] org.glassfish.jersey.tests.integration:jersey-3662:jar:2.35-SNAPSHOT
[INFO] +- org.glassfish.jersey.test-framework.providers:jersey-test-framework-provider-grizzly2:jar:2.35-SNAPSHOT:compile
[INFO] |  +- jakarta.servlet:jakarta.servlet-api:jar:4.0.3:compile
[INFO] |  +- org.glassfish.jersey.test-framework:jersey-test-framework-core:jar:2.35-SNAPSHOT:compile
[INFO] |  |  +- jakarta.xml.bind:jakarta.xml.bind-api:jar:2.3.3:compile
[INFO] |  |  |  \- jakarta.activation:jakarta.activation-api:jar:1.2.2:compile
[INFO] |  |  +- org.glassfish.jersey.core:jersey-server:jar:2.35-SNAPSHOT:compile
[INFO] |  |  |  +- org.glassfish.jersey.core:jersey-client:jar:2.35-SNAPSHOT:compile
[INFO] |  |  |  \- jakarta.validation:jakarta.validation-api:jar:2.0.2:compile
[INFO] |  |  +- org.glassfish.jersey.media:jersey-media-jaxb:jar:2.35-SNAPSHOT:compile
[INFO] |  |  \- org.glassfish.jersey.containers:jersey-container-servlet-core:jar:2.35-SNAPSHOT:compile
[INFO] |  +- org.glassfish.jersey.containers:jersey-container-grizzly2-http:jar:2.35-SNAPSHOT:compile
[INFO] |  |  +- org.glassfish.hk2.external:jakarta.inject:jar:2.6.1:compile
[INFO] |  |  +- org.glassfish.grizzly:grizzly-http-server:jar:2.4.4:compile
[INFO] |  |  |  \- org.glassfish.grizzly:grizzly-http:jar:2.4.4:compile
[INFO] |  |  |     \- org.glassfish.grizzly:grizzly-framework:jar:2.4.4:compile
[INFO] |  |  \- jakarta.ws.rs:jakarta.ws.rs-api:jar:2.1.6:compile
[INFO] |  \- org.glassfish.jersey.containers:jersey-container-grizzly2-servlet:jar:2.35-SNAPSHOT:compile
[INFO] |     +- org.glassfish.jersey.containers:jersey-container-servlet:jar:2.35-SNAPSHOT:compile
[INFO] |     \- org.glassfish.grizzly:grizzly-http-servlet:jar:2.4.4:compile
[INFO] +- org.junit.jupiter:junit-jupiter:jar:5.6.0:test
[INFO] |  +- org.junit.jupiter:junit-jupiter-api:jar:5.6.0:test
[INFO] |  |  +- org.apiguardian:apiguardian-api:jar:1.1.0:test
[INFO] |  |  +- org.opentest4j:opentest4j:jar:1.2.0:test
[INFO] |  |  \- org.junit.platform:junit-platform-commons:jar:1.6.0:test
[INFO] |  +- org.junit.jupiter:junit-jupiter-params:jar:5.6.0:test
[INFO] |  \- org.junit.jupiter:junit-jupiter-engine:jar:5.6.0:test
[INFO] |     \- org.junit.platform:junit-platform-engine:jar:1.6.0:test
[INFO] \- org.glassfish.jersey.inject:jersey-hk2:jar:2.35-SNAPSHOT:compile
[INFO]    +- org.glassfish.jersey.core:jersey-common:jar:2.35-SNAPSHOT:compile
[INFO]    |  +- jakarta.annotation:jakarta.annotation-api:jar:1.3.5:compile
[INFO]    |  \- org.glassfish.hk2:osgi-resource-locator:jar:1.0.3:compile
[INFO]    +- org.glassfish.hk2:hk2-locator:jar:2.6.1:compile
[INFO]    |  +- org.glassfish.hk2.external:aopalliance-repackaged:jar:2.6.1:compile
[INFO]    |  +- org.glassfish.hk2:hk2-api:jar:2.6.1:compile
[INFO]    |  \- org.glassfish.hk2:hk2-utils:jar:2.6.1:compile
[INFO]    \- org.javassist:javassist:jar:3.25.0-GA:compile

[senivam]

CQ# 23617 resolved

[senivam]

LGTM