Allow concurrent workflows

Currently we can't have more than 1 CI/CD workflow run in progress. This
slows down our deployments. We have existing internal controls to guard
against older deployments overwriting newer ones.

Test plan:
- Confirm workflows are allowed to run concurrently

.github/workflows/master.yml

@@ -13,10 +13,6 @@ permissions:
   pages: write
   id-token: write
 
-concurrency:
-  group: "pages"
-  cancel-in-progress: false
-
 jobs:
   setup:
     continue-on-error: true