Consider using environment_url instead of log_url for target environment

[kshehadeh]

Based on what I'm seeing here and the behavior I'm seeing in Jira, the integration between jira is using the deployment status log_url instead of the environment_url. Given that I believe the link is to supposed to go to the deployment url, can we change this to point to the environment_url property in the github deployment status instead of the log_url?

https://github.com/atlassian/github-for-jira/blob/e60fdc9153081f32bd0574d680a12522e1021f25/src/sync/deployment.ts#L67