fix(Brevo Node): Rename SendInBlue node to Brevo node (#6521)

* rename sendinblue to brevo

* refactor sendinblue node files/folders to brevo

* update codex node, documentation urls and api baseUrls

* adding comments to original node names

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

@@ -0,0 +1,41 @@
+import type {
+	IAuthenticateGeneric,
+	ICredentialTestRequest,
+	ICredentialType,
+	INodeProperties,
+} from 'n8n-workflow';
+
+export class BrevoApi implements ICredentialType {
+	// keep sendinblue name for backward compatibility
+	name = 'sendInBlueApi';
+
+	displayName = 'Brevo';
+
+	documentationUrl = 'brevo';
+
+	properties: INodeProperties[] = [
+		{
+			displayName: 'API Key',
+			name: 'apiKey',
+			type: 'string',
+			typeOptions: { password: true },
+			default: '',
+		},
+	];
+
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			headers: {
+				'api-key': '={{$credentials.apiKey}}',
+			},
+		},
+	};
+
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: 'https://api.brevo.com/v3',
+			url: '/account',
+		},
+	};
+}