chore(ci): address start-runner edge-cases (#5888)

AztecProtocol/ec2-action-builder@a576467

- Tries to address runner finding unusable spot, we now stop it and
restart. Not fully sure why this would be the case, but it came up and
allows for recovery. Also poll less in case it was a rate limit issue.

- Add a minute polling logic around both creating spot and then creating
on-demand. This might add a minute to most builds - so will be
monitoring - but should be no different than our old spot start times
with circleci

.github/workflows/setup-runner.yml

@@ -58,7 +58,7 @@ jobs:
       group: start-builder-${{ inputs.runner_label }}
     steps:
       - name: Start EC2 runner
-        uses: AztecProtocol/ec2-action-builder@v0.14e
+        uses: AztecProtocol/ec2-action-builder@v0.15
         with:
           github_token: ${{ secrets.GH_SELF_HOSTED_RUNNER_TOKEN }}
           aws_access_key_id: ${{ secrets.AWS_ACCESS_KEY_ID }}