Make pact tests work in dev mode

[holly-cummins]

Resolves #11

This PR does the following:

• Enable the integration tests, which had been failing
• Use filtered versions rather than hardcoded versions in the integration project pom
• Add a dummy test to help problem diagnosis in the integration tests
• Make the integration tests work, by …
• Setting the scope of the extension dependency to not-test; this isn’t great, but may be hard to fix.
• Making pact work in dev mode

The changes to make pact work in dev mode are

• Add the quarkus kotlin extension as a dependency to the extension
• Set a bunch of libraries used by pact to be parent first, to work around NoClassDefFoundError issues. I’m a bit concerned about the implications of this change, since parent-firstness tends to spread virally through a codebase via transitive dependencies. However, I also don’t see an alternative.

[holly-cummins]

When running with a version of Quarkus with quarkusio/quarkus#29697 the changes in this PR will be counter-productive, and a different set of changes will be needed. However, since that change is unlikely to be released in the 2.x branch, merging this.