fix: Update Curl Command for Build_URL

[timckt]

• The current variable BUILD_URL is as below:, there is an expected extra created, in the output, which caused the notifyUserApplyFailed cannot work properly and cannot send message to Slack.

→ curl -L \
                  -H "Accept: application/vnd.github+json" \
                  -H "Authorization: Bearer $GITHUB_TOKEN" \
                  -H "X-GitHub-Api-Version: 2022-11-28" \
                  "https://api.github.com/repos/ministryofjustice/cloud-platform-environments/issues/$PR/comments" | jq '.[].body' | awk '{print $9}' | tr -d '"'

Output:

created,
https://concourse.cloud-platform.service.justice.gov.uk/teams/main/pipelines/environments-live/jobs/apply-namespace-changes-live/builds/9493

• This PR is to update the BUILD_URL curl command to:

  • Extract only the Concourse build link
  • Ensure that the extracted URL corresponds to the latest build (e.g., if builds are rerun, the output might include 100, 100.1, 100.2, etc., and the latest URL should be captured—100.2).

• Relates to Concourse Bot not Outputting to Ask Channel cloud-platform#6578