feat: Add sys prop to set default Pact spec version; deprecate PactSp… #1677

Job	Run time
latest_jdk (ubuntu-latest, core)	2m 33s
latest_jdk (ubuntu-latest, consumer -x :consumer:junit:clojureTest)	4m 38s
latest_jdk (ubuntu-latest, provider)	5m 26s
latest_jdk (ubuntu-latest, pact-specification-test)	2m 26s
latest_jdk (windows-latest, core)	5m 12s
latest_jdk (windows-latest, consumer -x :consumer:junit:clojureTest)	6m 36s
latest_jdk (windows-latest, provider)	7m 27s
latest_jdk (windows-latest, pact-specification-test)	4m 14s
latest_jdk (macos-latest, core)	3m 38s
latest_jdk (macos-latest, consumer -x :consumer:junit:clojureTest)	5m 37s
latest_jdk (macos-latest, provider)	5m 59s
latest_jdk (macos-latest, pact-specification-test)	3m 27s
supported_jdks (core, 11)	2m 48s
supported_jdks (core, 17)	2m 53s
supported_jdks (core, 18)	2m 38s
supported_jdks (consumer, 11)	4m 9s
supported_jdks (consumer, 17)	5m 32s
supported_jdks (consumer, 18)	4m 30s
supported_jdks (provider, 11)	4m 36s
supported_jdks (provider, 17)	7m 13s
supported_jdks (provider, 18)	5m 34s
supported_jdks (pact-specification-test, 11)	2m 6s
supported_jdks (pact-specification-test, 17)	2m 39s
supported_jdks (pact-specification-test, 18)	1m 51s
	1h 43m 42s

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