[bento][ads_ranking] update pydantic to 2.7.4 and keep modules in `…

…ads_ranking` to be compatible with `pydantic` v1/v2

Summary:
as title
* update `pydantic` to 2.7.4 in `ads_ranking` bento kernel
* below 3 modules will follow [code](https://github.com/langchain-ai/langchain/blob/master/libs/core/langchain_core/pydantic_v1/__init__.py) to be compatible with `pydantic` v1/v2 (they still use pydantic v1)
  - `fbcode/admarket/ads_copilot`
  - `fbcode/admarket/revenue/scripts/forecast/model`
  - `fbcode/admarket/signals/integrity/hackathon/`

This will enable:
- `pydantic` v2 is accessible in `ads_ranking` bento kernel
- current modules relying on `pydantic` v1 keep using v1
- current modules relying on `pydantic` v1 can plan/test migrating to v2 as needed

Test Plan:
* sandcastle
* build local `ads_ranking` bento kernel and test import
  - build local kernel
  ```
  [[email protected] ~/fbsource/fbcode (bfd9942bb)]$ bento kernel build ads_ranking
  ... ...
  Buck UI: https://www.internalfb.com/buck2/3f0c71df-0f66-4844-b53e-9ae74405d0cc
  ... ...
  BUILD SUCCEEDED
  ```
  - test import in local kernel (N5605155)
   {F1760989728}

Differential Revision: D59764837

fbshipit-source-id: 96e0fb99f9bea0b2ab1836389c661f1108f1e08d

antlir/shape.py

@@ -13,15 +13,21 @@
 import os
 from typing import Type, TypeVar, Union
 
-import pydantic
 from antlir.freeze import DoNotFreeze, freeze
 from antlir.fs_utils import Path
 
+try:
+    from pydantic.v1 import BaseModel  # pragma: no cover  # noqa: F403
+    from pydantic.v1.main import ModelMetaclass  # pragma: no cover  # type: ignore
+except ImportError:
+    from pydantic import BaseModel  # type: ignore  # noqa: F403
+    from pydantic.main import ModelMetaclass  # type: ignore  # noqa: F403
+
 
 S = TypeVar("S")
 
 
-class ShapeMeta(pydantic.main.ModelMetaclass):
+class ShapeMeta(ModelMetaclass):
     def __new__(metacls, name, bases, dct):  # noqa: B902
         cls = super().__new__(metacls, name, bases, dct)
         # Only apply shape meta hacks to generated classes, not user-written
@@ -61,7 +67,7 @@ def __repr__(cls) -> str:  # noqa: B902
         return f"{clsname}({fields})"
 
 
-class Shape(pydantic.BaseModel, DoNotFreeze, metaclass=ShapeMeta):
+class Shape(BaseModel, DoNotFreeze, metaclass=ShapeMeta):
     class Config:
         allow_mutation = False