Resolving nested structured config of Lists with interpolation raises ValidationError

[soldni]

Describe the bug This is a follow up to #847; OmegaConf raises a ValidationError when trying to use an interpolation inside a structured ListConfig.

To Reproduce

from omegaconf import OmegaConf, MISSING, II
from dataclasses import dataclass
from typing import List


@dataclass
class User:
    name: str = MISSING


@dataclass
class Config:
    user: User = User("John")
    admins: List[User] = "[${user}]"


cfg: Config = OmegaConf.structured(Config)
OmegaConf.resolve(cfg) # this  raises ValidationError

Expected behavior I expect this resolution to not fail.

Additional context

• [x] OmegaConf version: 2.2.3
• [x] Python version: 3.9
• [x] Operating system: macOS 12.5.1
• [x] Please provide a minimal repro