chore: import upstream snapshot with attribution

.github/scripts/integration-exists.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+if [ -z "$1" ]; then
+  echo "Error: integration name is not provided" >&2 
+  exit 1
+fi
+integration=$1
+            
+integration_path="integrations/$integration"
+if ! integration_def=$(pnpm bp read --work-dir "$integration_path" --json); then
+  echo "Error: Failed to read integration definition for \"$integration\". Check the integration for TypeScript errors." >&2
+  exit 1
+fi
+
+name=$(echo "$integration_def" | jq -r ".name")
+version=$(echo "$integration_def" | jq -r ".version")
+
+exists=$(pnpm bp integrations ls --name "$name" --version-number "$version" --json | jq '[ .[] | select(.public) ] | length') # 0 if not exists
+echo "$exists"