Update slack notification job to work correctly with Find

Given the job definition comes from Children's barred list, we need to
amend some of its details so it works with Find.

Specifically, Find doesn't currently store its secrets as YAML like
other services do. We need to change the way we retrieve the
SLACK_WEBHOOK secret from the Find infrastructure vault.

.github/workflows/build-and-deploy.yml

@@ -143,30 +143,28 @@ jobs:
             job=deploy_production
           fi
           tf_vars_file=aks/config/${{ env.ENVIRONMENT_NAME }}.tfvars.json
-          echo "KEY_VAULT_NAME=$(jq -r '.key_vault_name' ${tf_vars_file})" >> $GITHUB_ENV
-          echo "KEY_VAULT_INFRA_SECRET_NAME=$(jq -r '.key_vault_infra_secret_name' ${tf_vars_file})" >> $GITHUB_ENV
+          echo "KEY_VAULT_NAME=$(jq -r '.inf_vault_name' ${tf_vars_file})" >> $GITHUB_ENV
           echo "JOB=${job}" >> $GITHUB_ENV
-          echo "REVIEW=${review}" >> $GITHUB_ENV
 
       - uses: Azure/login@v1
         with:
           creds: ${{ secrets.AZURE_CREDENTIALS }}
 
-      - uses: DfE-Digital/keyvault-yaml-secret@v1
-        id: get_monitoring_secret
+      - name: Fetch slack web hook
+        uses: azure/CLI@v1
+        id: slack-web-hook
         with:
-          keyvault: ${{ env.KEY_VAULT_NAME }}
-          secret: ${{ env.KEY_VAULT_INFRA_SECRET_NAME }}
-          key: SLACK_WEBHOOK
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          inlineScript: |
+            SECRET_VALUE=$(az keyvault secret show --name "SLACK-WEBHOOK" --vault-name "${{ env.KEY_VAULT_NAME }}" --query "value" -o tsv)
+            echo "::add-mask::$SECRET_VALUE"
+            echo "SLACK_WEBHOOK=$SECRET_VALUE" >> $GITHUB_OUTPUT
 
       - name: Notify Slack channel on job failure
         uses: rtCamp/action-slack-notify@v2
         env:
           SLACK_USERNAME: CI Deployment
-          SLACK_TITLE: Deployment of check-the-childrens-barred-list ${{ env.REVIEW && 'review' }} failed
+          SLACK_TITLE: Deployment of Find a lost TRN failed
           SLACK_MESSAGE: Job ${{ env.JOB }} failed
-          SLACK_WEBHOOK: ${{ steps.get_monitoring_secret.outputs.SLACK_WEBHOOK }}
+          SLACK_WEBHOOK: ${{ steps.slack-web-hook.outputs.SLACK_WEBHOOK }}
           SLACK_COLOR: failure
           SLACK_FOOTER: Sent from Build and Deploy workflow