feat(core): Add support for pairedItem (beta) (#3012)

* ✨ Add pairedItem support

* 👕 Fix lint issue

* 🐛 Fix resolution in frontend

* 🐛 Fix resolution issue

* 🐛 Fix resolution in frontend

* 🐛 Fix another resolution issue in frontend

* ⚡ Try to automatically add pairedItem data if possible

* ⚡ Cleanup

* ⚡ Display expression errors in editor UI

* 🐛 Fix issue that it did not display errors in production

* 🐛 Fix auto-fix of missing pairedItem data

* 🐛 Fix frontend resolution for not executed nodes

* ⚡ Fail execution on pairedItem resolve issue and display information
about itemIndex and runIndex

* ⚡ Allow that pairedItem is only set to number if runIndex is 0

* ✨ Improve Expression Errors

* ⚡ Remove no longer needed code

* ⚡ Make errors more helpful

* ⚡ Add additional errors

* 👕 Fix lint issue

* ⚡ Add pairedItem support to core nodes

* ⚡ Improve support in Merge-Node

* ⚡ Fix issue with not correctly converted incoming pairedItem data

* 🐛 Fix frontend resolve issue

* 🐛 Fix frontend parameter name display issue

* ⚡ Improve errors

* 👕 Fix lint issue

* ⚡ Improve errors

* ⚡ Make it possible to display parameter name in error messages

* ⚡ Improve error messages

* ⚡ Fix error message

* ⚡ Improve error messages

* ⚡ Add another error message

* ⚡ Simplify

packages/nodes-base/nodes/Xml/Xml.node.ts

@@ -262,13 +262,23 @@ export class Xml implements INodeType {
 						json: {
 							[dataPropertyName]: builder.buildObject(items[itemIndex].json),
 						},
+						pairedItem: {
+							item: itemIndex,
+						},
 					});
 				} else {
 					throw new NodeOperationError(this.getNode(), `The operation "${mode}" is not known!`);
 				}
 			} catch (error) {
 				if (this.continueOnFail()) {
-					items[itemIndex] = ({json:{ error: error.message }});
+					items[itemIndex] = ({
+						json: {
+							error: error.message,
+						},
+						pairedItem: {
+							item: itemIndex,
+						},
+					});
 					continue;
 				}
 				throw error;