test: add Prism-based OpenAPI mock verification

Signed-off-by: laurentketterle-hub <laurentketterle-hub@users.noreply.github.com>

Author: laurentketterle-hub

tests/pact/prism-replay-corpus.json

@@ -0,0 +1,6 @@
+[
+  { "method": "GET", "path": "/api/health" },
+  { "method": "GET", "path": "/api/v1/plans" },
+  { "method": "GET", "path": "/api/subscriptions" },
+  { "method": "GET", "path": "/api/subscriptions/{id}" }
+]