Flaky test fix - org.kie.server.integrationtests.jbpm.cases.CaseRuntimeDataServiceIntegrationTest#testFindCaseTasksAssignedAsBusinessAdminByPassAuth

There's a flaky test which fails when comparing empty strings in a task description [1]. Depending on what DB is used for the same, it may fail or succeed depending on the db used. 

expected:<> but was:<null>

This depends on how DB is treating the empty string. For instance, Oracle will consider NULL value when inserting an empty string into a varchar column. Thus, the test will fail, depending on the DB used to run the integration test.

[1] - https://github.com/kiegroup/droolsjbpm-integration/blob/main/kie-server-parent/kie-server-tests/kie-server-integ-tests-all/src/test/java/org/kie/server/integrationtests/jbpm/cases/CaseRuntimeDataServiceIntegrationTest.java#L2582