chore(*): remove unused code (#6781)

The code removed in the PR was flagged as unused by the JetBrains
inspector.

I did a QA on the dev environment but other checks are highly
recommended.

There is one commit by scope to make the review easier.

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/decorators/ability/user-ability.decorator.ts

@@ -1,11 +0,0 @@
-import { createParamDecorator, ExecutionContext } from '@nestjs/common';
-
-import { getRequest } from 'src/utils/extract-request';
-
-export const UserAbility = createParamDecorator(
-  (_: unknown, context: ExecutionContext) => {
-    const request = getRequest(context);
-
-    return request.ability;
-  },
-);

packages/twenty-server/src/engine/decorators/observability/log-execution-time.decorator.ts

@@ -3,9 +3,6 @@ import { Logger } from '@nestjs/common';
 /**
  * A decorator function that logs the execution time of the decorated method.
  *
- * @param target The target class of the decorated method.
- * @param propertyKey The name of the decorated method.
- * @param descriptor The property descriptor of the decorated method.
  * @returns The modified property descriptor with the execution time logging functionality.
  */
 export function LogExecutionTime() {