Discard empty and null links in Links fields (#12188)

This PR has several objectives:

- Ignore invalid and empty links in the frontend
- Ignore empty links when creating or updating a link field in the
backend
- Throw an error when trying to create or update a link field with an
invalid link

The logic is mostly the same in the frontend and the backend: we take
the initial primaryLink and the secondaryLinks, we discard all the empty
links (with `url === '' || url === null`), and the primaryLink becomes
the first remaining link.

## Frontend

There are three parts in the frontend where we have to remove the empty
links:

- LinksDisplay
- LinksFieldInput
- isFieldValueEmpty; used in RecordInlineCell

## Backend

I put the logic in
`packages/twenty-server/src/engine/core-modules/record-transformer/services/record-input-transformer.service.ts`
as it's used by the REST API, the GraphQL API, and by Create Record and
Update Record actions in the workflows.

packages/twenty-server/src/engine/api/graphql/workspace-query-runner/utils/workspace-query-runner-graphql-api-exception-handler.util.ts

@@ -7,6 +7,8 @@ import { graphqlQueryRunnerExceptionHandler } from 'src/engine/api/graphql/works
 import { handleDuplicateKeyError } from 'src/engine/api/graphql/workspace-query-runner/utils/handle-duplicate-key-error.util';
 import { workspaceExceptionHandler } from 'src/engine/api/graphql/workspace-query-runner/utils/workspace-exception-handler.util';
 import { WorkspaceQueryRunnerException } from 'src/engine/api/graphql/workspace-query-runner/workspace-query-runner.exception';
+import { RecordTransformerException } from 'src/engine/core-modules/record-transformer/record-transformer.exception';
+import { recordTransformerGraphqlApiExceptionHandler } from 'src/engine/core-modules/record-transformer/utils/record-transformer-graphql-api-exception-handler.util';
 import { PermissionsException } from 'src/engine/metadata-modules/permissions/permissions.exception';
 import { permissionGraphqlApiExceptionHandler } from 'src/engine/metadata-modules/permissions/utils/permission-graphql-api-exception-handler.util';
 
@@ -23,6 +25,8 @@ export const workspaceQueryRunnerGraphqlApiExceptionHandler = (
       }
       throw error;
     }
+    case error instanceof RecordTransformerException:
+      return recordTransformerGraphqlApiExceptionHandler(error);
     case error instanceof PermissionsException:
       return permissionGraphqlApiExceptionHandler(error);
     case error instanceof WorkspaceQueryRunnerException: