Rename mutation maximum affected records (#6042)

As per my last comment on https://github.com/twentyhq/twenty/pull/6039,
we decided to rename this var

packages/twenty-server/src/engine/integrations/environment/environment-variables.ts

@@ -324,7 +324,7 @@ export class EnvironmentVariables {
   @CastToPositiveNumber()
   @IsOptional()
   @IsNumber()
-  MUTATION_MAXIMUM_RECORD_AFFECTED = 100;
+  MUTATION_MAXIMUM_AFFECTED_RECORDS = 100;
 
   REDIS_HOST = '127.0.0.1';