fix: trigger one webhook for each pact publication that the verified …

[bethesque]

…content belongs to when using the 'pacts for verification' API

Fixes #362

[bethesque]

Logs from the demo webmock server running this repo script https://github.com/pact-foundation/pact_broker/blob/issue/pact-broker-377/script/reproduce-issue.rb On 2.76.0.0 it only shoes one verification event. With this code, there are two.

{"eventName":"contract_published","consumerVersionNumber":"1","consumerVersionTags":"main","githubVerificationStatus":"pending","providerVersionNumber":"","providerVersionTags":""}
::1 - - [29/Jan/2021:11:56:08 +1100] "POST / HTTP/1.1" 200 18 0.0012
{"eventName":"contract_published","consumerVersionNumber":"2","consumerVersionTags":"feat/x, feat/y","githubVerificationStatus":"pending","providerVersionNumber":"","providerVersionTags":""}
::1 - - [29/Jan/2021:11:56:08 +1100] "POST / HTTP/1.1" 200 18 0.0004

{"eventName":"provider_verification_published","consumerVersionNumber":"1","consumerVersionTags":"main","githubVerificationStatus":"success","providerVersionNumber":"1","providerVersionTags":"main"}
::1 - - [29/Jan/2021:11:56:18 +1100] "POST / HTTP/1.1" 200 18 0.0004
{"eventName":"provider_verification_published","consumerVersionNumber":"2","consumerVersionTags":"feat/x, feat/y","githubVerificationStatus":"success","providerVersionNumber":"1","providerVersionTags":"main"}