[SUREFIRE-1947] Maven Failsafe Plugin - Junit5 extension autodetection no longer works in M5

**[Marc Nuri](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=manusa)** opened **[SUREFIRE-1947](https://issues.apache.org/jira/browse/SUREFIRE-1947?redirect=false)** and commented

After the upgrade from [3.0.0-M4 to 3.0.0-M5](https://github.com/jkubeio/jkube-integration-tests/pull/111), one of our extensions registered using Java SPI is no longer detected.

The applicable extension is [ReportExtension](https://github.com/jkubeio/jkube-integration-tests/blob/99eb3e7905e88ffb44579df35df883b5d4248461/it/src/test/java/org/eclipse/jkube/integrationtests/ReportExtension.java) which is registered via a [org.junit.jupiter.api.extension.Extension](https://github.com/jkubeio/jkube-integration-tests/blob/99eb3e7905e88ffb44579df35df883b5d4248461/it/src/test/resources/META-INF/services/org.junit.jupiter.api.extension.Extension) file.
Autodetection is enabled in [junit-platform.properties](https://github.com/jkubeio/jkube-integration-tests/blob/99eb3e7905e88ffb44579df35df883b5d4248461/it/src/test/resources/junit-platform.properties).

The same configuration works fine in M4, but fails in M5.

I couldn't find anything related to that in the release notes or project documentation.

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**Affects:** 3.0.0-M5

Start with the linked integration-test ReportExtension.java, its META-INF/services/org.junit.jupiter.api.extension.Extension registration, and junit-platform.properties. Reproduce the extension autodetection behavior with Maven Failsafe 3.0.0-M4 and M5, then inspect the Surefire/Failsafe changes between those versions. Done means the Java SPI extension is detected under M5 and the regression is covered by a test.

Written by the indexing model from the issue text.