⚡ Add sandbox option to Salesforce OAuth2 credentials (#1979)

* ⚡ Add environment dropdown to OAuth2 creds

* ⚡ Add sandbox URL to OAuth2 call

* ⏪ Revert options change

* ⚡ Set OAuth2 URLs with expressions

* ⚡ Extract instance URL from credentials

packages/nodes-base/credentials/SalesforceOAuth2Api.credentials.ts

@@ -11,19 +11,35 @@ export class SalesforceOAuth2Api implements ICredentialType {
 	displayName = 'Salesforce OAuth2 API';
 	documentationUrl = 'salesforce';
 	properties: INodeProperties[] = [
+		{
+			displayName: 'Environment Type',
+			name: 'environment',
+			type: 'options',
+			options: [
+				{
+					name: 'Production',
+					value: 'production',
+				},
+				{
+					name: 'Sandbox',
+					value: 'sandbox',
+				},
+			],
+			default: 'production',
+		},
 		{
 			displayName: 'Authorization URL',
 			name: 'authUrl',
 			type: 'hidden',
-			default: 'https://login.salesforce.com/services/oauth2/authorize',
 			required: true,
+			default: '={{ $self["environment"] === "sandbox" ? "https://test.salesforce.com/services/oauth2/authorize" : "https://login.salesforce.com/services/oauth2/authorize" }}',
 		},
 		{
 			displayName: 'Access Token URL',
 			name: 'accessTokenUrl',
-			type: 'string',
-			default: 'https://yourcompany.salesforce.com/services/oauth2/token',
+			type: 'hidden',
 			required: true,
+			default: '={{ $self["environment"] === "sandbox" ? "https://test.salesforce.com/services/oauth2/token" : "https://login.salesforce.com/services/oauth2/token" }}',
 		},
 		{
 			displayName: 'Scope',