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acb62cd5 - [ty] Pydantic: Make `BaseSettings` fields optional by default (#26628)

[ty] Pydantic: Make `BaseSettings` fields optional by default (#26628) ## Summary `BaseSettings` fields can be supplied via environment variables. To support this use case, we make all fields on these models optional by default. ```py from pydantic_settings import BaseSettings class Settings(BaseSettings): host: str port: int # Would succeed at runtime if HOST and PORT environment variables are set Settings() ``` closes https://github.com/astral-sh/ty/issues/1070 towards https://github.com/astral-sh/ty/issues/2403 ## Test Plan Updated existing Markdown tests