PactBrokerLoader should use contextual ValueResolver to determine whether to fallback to tags

[haha02]

Hi team, I found that when using PactVerificationSpringProvider, my pactbroker.consumerversionselectors.tags property setting in the Spring application.yml file is not working. I believe this issue is caused by the implementation of PactBrokerLoader. buildConsumerVersionSelectors:

https://github.com/DiUS/pact-jvm/blob/ec3c777f6626cd6f8c2a09e6194e00d5cf0f9378/provider/src/main/kotlin/au/com/dius/pact/provider/junitsupport/loader/PactBrokerLoader.kt#L113-L117

At line 115, it should pass the resolver to the shouldFallBackToTags() and:

https://github.com/DiUS/pact-jvm/blob/ec3c777f6626cd6f8c2a09e6194e00d5cf0f9378/provider/src/main/kotlin/au/com/dius/pact/provider/junitsupport/loader/PactBrokerLoader.kt#L131-L134

At line 133, it should use the passed-in value resolver to call parseListExpression.

Current implementation will use the default resolver SystemPropertyResolver, which is not consistent with other parseListExpression calls in buildConsumerVersionSelectors.

[uglyog]

Thanks for the investigation into the issue