Fix query runner throwing 500 when pg_graphql detects unique constraint (#5323)

## Context
Since pg_graphql does not return specific error/exception, we have to
map the error message and throw validation errors when needed
This PR adds a check on unicity constraint error returned by pg_graphql
when we are trying to insert duplicate records and returns a 400 instead
of being handled by the exceptionHandler as a 500.

packages/twenty-server/src/engine/api/graphql/workspace-query-runner/utils/compute-pg-graphql-error.util.ts

@@ -8,10 +8,24 @@ interface PgGraphQLErrorMapping {
   [key: string]: (command: string, objectName: string) => HttpException;
 }
 
+const pgGraphQLCommandMapping = {
+  insertInto: 'insert',
+  update: 'update',
+  deleteFrom: 'delete',
+};
+
 const pgGraphQLErrorMapping: PgGraphQLErrorMapping = {
   'delete impacts too many records': (command, objectName) =>
     new BadRequestException(
-      `Cannot ${command} ${objectName} because it impacts too many records.`,
+      `Cannot ${
+        pgGraphQLCommandMapping[command] ?? command
+      } ${objectName} because it impacts too many records.`,
+    ),
+  'duplicate key value violates unique constraint': (command, objectName) =>
+    new BadRequestException(
+      `Cannot ${
+        pgGraphQLCommandMapping[command] ?? command
+      } ${objectName} because it violates a uniqueness constraint.`,
     ),
 };
 
@@ -22,7 +36,14 @@ export const computePgGraphQLError = (
 ) => {
   const error = errors[0];
   const errorMessage = error?.message;
-  const mappedError = pgGraphQLErrorMapping[errorMessage];
+
+  const mappedErrorKey = Object.keys(pgGraphQLErrorMapping).find(
+    (key) => errorMessage?.startsWith(key),
+  );
+
+  const mappedError = mappedErrorKey
+    ? pgGraphQLErrorMapping[mappedErrorKey]
+    : null;
 
   if (mappedError) {
     return mappedError(command, objectName);

packages/twenty-server/src/engine/api/graphql/workspace-query-runner/workspace-query-runner.service.ts

@@ -599,13 +599,6 @@ export class WorkspaceQueryRunnerService {
     const result = graphqlResult?.[0]?.resolve?.data?.[entityKey];
     const errors = graphqlResult?.[0]?.resolve?.errors;
 
-    if (!result) {
-      this.logger.log(
-        `No result found for ${entityKey}, graphqlResult: ` +
-          JSON.stringify(graphqlResult, null, 3),
-      );
-    }
-
     if (
       result &&
       ['update', 'deleteFrom'].includes(command) &&