poc of validate config (#24837)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/core/app/app_config/features/more_like_this/manager.py

+from pydantic import BaseModel, Field, ValidationError
+
+
+class MoreLikeThisConfig(BaseModel):
+    enabled: bool = False
+
+
+class AppConfigModel(BaseModel):
+    more_like_this: MoreLikeThisConfig = Field(default_factory=MoreLikeThisConfig)
+
+
 class MoreLikeThisConfigManager:
     @classmethod
     def convert(cls, config: dict) -> bool:
 
         :param config: model config args
         """
-        more_like_this = False
-        more_like_this_dict = config.get("more_like_this")
-        if more_like_this_dict:
-            if more_like_this_dict.get("enabled"):
-                more_like_this = True
-
-        return more_like_this
+        validated_config, _ = cls.validate_and_set_defaults(config)
+        return AppConfigModel.model_validate(validated_config).more_like_this.enabled
 
     @classmethod
     def validate_and_set_defaults(cls, config: dict) -> tuple[dict, list[str]]:
-        """
-        Validate and set defaults for more like this feature
-
-        :param config: app model config args
-        """
-        if not config.get("more_like_this"):
-            config["more_like_this"] = {"enabled": False}
-
-        if not isinstance(config["more_like_this"], dict):
-            raise ValueError("more_like_this must be of dict type")
-
-        if "enabled" not in config["more_like_this"] or not config["more_like_this"]["enabled"]:
-            config["more_like_this"]["enabled"] = False
-
-        if not isinstance(config["more_like_this"]["enabled"], bool):
-            raise ValueError("enabled in more_like_this must be of boolean type")
-
-        return config, ["more_like_this"]
+        try:
+            return AppConfigModel.model_validate(config).dict(), ["more_like_this"]
+        except ValidationError as e:
+            raise ValueError(
+                "more_like_this must be of dict type and enabled in more_like_this must be of boolean type"
+            )