Revert "Fix default port for mongosrv DSNs (#6827)"

[Kludex]

• This reverts Fix default port for mongosrv DSNs #6827.

Since we are reverting that PR, the idea is that we recommend doing the following for #6774:

from typing import Annotated

from pydantic.networks import UrlConstraints
from pydantic_core import MultiHostUrl

MongoSRVDsn = Annotated[MultiHostUrl, UrlConstraints(allowed_schemes=['mongodb+srv'])]

Related issue number

• Closes MongoDsn.build gives AttributeError #6945

Notes

@dmontagu mentioned that we should keep the tests that were added. So I'll add on the next commit... Added.

Selected Reviewer: @davidhewitt

[cloudflare-pages]

Deploying with    Cloudflare Pages

Latest commit:	a815afc
Status:	✅  Deploy successful!
Preview URL:	https://114fd311.pydantic-docs2.pages.dev
Branch Preview URL:	https://revert-union-mongodsn-2.pydantic-docs2.pages.dev

View logs

[Kludex]

please review