refactor(GitHub Trigger Node): Stop reporting to Sentry permission errors (no-changelog) (#7552)

https://n8nio.sentry.io/issues/4581327606/

packages/nodes-base/nodes/Github/GithubTrigger.node.ts

@@ -529,6 +529,7 @@ export class GithubTrigger implements INodeType {
 						throw new NodeOperationError(
 							this.getNode(),
 							'A webhook with the identical URL probably exists already. Please delete it manually on Github!',
+							{ severity: 'warning' },
 						);
 					}
 
@@ -536,6 +537,7 @@ export class GithubTrigger implements INodeType {
 						throw new NodeOperationError(
 							this.getNode(),
 							'Check that the repository exists and that you have permission to create the webhooks this node requires',
+							{ severity: 'warning' },
 						);
 					}