N8N-4126 credentials injection and testing on specific nodes (#3816)

* Add credential injection and testing to Lemlist, Uproc, Supabase, Segment, Phantombuster, Mailgun and Dropcontact

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

@@ -1,4 +1,9 @@
-import { ICredentialType, INodeProperties } from 'n8n-workflow';
+import {
+	IAuthenticateGeneric,
+	ICredentialTestRequest,
+	ICredentialType,
+	INodeProperties,
+} from 'n8n-workflow';
 
 export class SupabaseApi implements ICredentialType {
 	name = 'supabaseApi';
@@ -19,4 +24,22 @@ export class SupabaseApi implements ICredentialType {
 			default: '',
 		},
 	];
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			headers: {
+				apikey: '={{$credentials.serviceRole}}',
+				Authorization: '=Bearer {{$credentials.serviceRole}}',
+			},
+		},
+	};
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: '={{$credentials.host}}/rest/v1',
+			headers: {
+				Prefer: 'return=representation',
+			},
+			url: '/',
+		},
+	};
 }