chore(ci): cancel in-flight approvals when a PR is updated #337
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Every time a PR is updated it triggers a new run of the end-to-end tests workflow, which includes making a new deployment request for PRs from forks. This updates the end-to-end tests workflow so that, when a PR is updated, any in-flight approval jobs are canceled, and only the newest approval request is left running.
In addition, this sets concurrency on the end-to-end test job so that it has to run one-at-a-time to avoid flooding the API with requests if multiple end-to-end test runs are approved.