fix: server start and delete interactions order

[marcin-piwowarczyk-form3]

While running mock services api using IntegrationTest we have noticed errors in logs output caused by failed call to pact api with delete interactions request.

While investigating the root cause I noticed, the TestWithStubServices function is calling api endpoint using DeleteInteractions function before pact api server is started, causing connection errors.

Usually it's not causing any problems expect the errors in logs because we are removing interactions again in defer operation, anyway it's making noise in logs.

proxying request: Delete \"http://127.0.0.1:56983/interactions\": dial tcp 127.0.0.1:56983: connect: connection refused
proxying request: Delete \"http://127.0.0.1:56984/interactions\": dial tcp 127.0.0.1:56984: connect: connection refused

Changing order of the operations in the way we are starting pact server before deleting interactions is solving the issue.