Fix integration test report locations

[vpavic]

IntegrationTestPlugin currently defines the following report locations:

html.destination = project.file("$project.buildDir/reports/integration-tests/")
junitXml.destination = project.file("$project.buildDir/integration-test-results/")

This is inconsistent with locations for standard tests, which are:

• build/reports/tests/test/
• build/test-results/test/

Consequently, Spring Security and Spring Session Jenkins builds, which define junit '**/build/*-results/*.xml' in Jenkinsfile end up picking only reports for integration tests.

This PR removes explicit report locations in IntegrationTestPlugin so that the reports end up in:

• build/reports/tests/integrationTest/
• build/test-results/integrationTest/

Consuming projects will then need to update their Jenkinsfile to define junit '*/build/test-results/*/*.xml'

[rwinch]

Thanks this is now merged @vpavic!