Refactor: Move trigger field configs to separate modules

- Create dedicated triggers directory for trigger field configurations
- Extract collection, webhook, global, and cron trigger fields into separate modules
- Improve code organization and maintainability
- Update Workflow.ts to use the new modular trigger imports

src/triggers/global-trigger.ts

@@ -0,0 +1,56 @@
+import type { Field } from 'payload'
+
+export function getGlobalTriggerFields(): Field[] {
+  return [
+    {
+      name: '__builtin_global',
+      type: 'select',
+      admin: {
+        condition: (_, siblingData) => siblingData?.type === 'global-trigger',
+        description: 'Global that triggers the workflow',
+      },
+      hooks: {
+        afterRead: [
+          ({ siblingData }) => {
+            return siblingData?.parameters?.global || undefined
+          }
+        ],
+        beforeChange: [
+          ({ siblingData, value }) => {
+            if (!siblingData.parameters) {siblingData.parameters = {}}
+            siblingData.parameters.global = value
+            return undefined // Virtual field, don't store directly
+          }
+        ]
+      },
+      options: [], // Will be populated dynamically based on available globals
+      virtual: true,
+    },
+    {
+      name: '__builtin_globalOperation',
+      type: 'select',
+      admin: {
+        condition: (_, siblingData) => siblingData?.type === 'global-trigger',
+        description: 'Global operation that triggers the workflow',
+      },
+      hooks: {
+        afterRead: [
+          ({ siblingData }) => {
+            return siblingData?.parameters?.globalOperation || undefined
+          }
+        ],
+        beforeChange: [
+          ({ siblingData, value }) => {
+            if (!siblingData.parameters) {siblingData.parameters = {}}
+            siblingData.parameters.globalOperation = value
+            return undefined // Virtual field, don't store directly
+          }
+        ]
+      },
+      options: [
+        'update'
+      ],
+      virtual: true,
+    }
+  ]
+}