[feat] Add updateRemoteServer endpoint (#5148)

## Context
#4765 

Following investigations
([#5083](https://github.com/twentyhq/twenty/issues/5083)) we decided to
restrict updates of server from which zero tables have been synchronized
only

## How was it tested
Locally with /metadata
1. Updating a database that already has synchronized tables
<img width="1072" alt="Capture d’écran 2024-04-24 à 16 16 05"
src="https://github.com/twentyhq/twenty/assets/51697796/f9a84c34-2dcd-4f3c-b0bc-b710abae5021">

2. Updating a database that has no synchronized tables
<img width="843" alt="Capture d’écran 2024-04-24 à 16 17 28"
src="https://github.com/twentyhq/twenty/assets/51697796/f320fe03-a6bc-4724-bcd0-4e89d3ac31f5">
+ tested that the connection works well

packages/twenty-server/src/engine/metadata-modules/remote-server/dtos/create-remote-server.input.ts

@@ -8,17 +8,17 @@ import {
   RemoteServerType,
   UserMappingOptions,
 } from 'src/engine/metadata-modules/remote-server/remote-server.entity';
+import { UserMappingOptionsInput } from 'src/engine/metadata-modules/remote-server/utils/user-mapping-options-input.utils';
 
 @InputType()
 export class CreateRemoteServerInput<T extends RemoteServerType> {
   @Field(() => String)
   foreignDataWrapperType: T;
 
-  @IsOptional()
   @Field(() => GraphQLJSON)
   foreignDataWrapperOptions: ForeignDataWrapperOptions<T>;
 
   @IsOptional()
-  @Field(() => GraphQLJSON, { nullable: true })
+  @Field(() => UserMappingOptionsInput, { nullable: true })
   userMappingOptions?: UserMappingOptions;
 }