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

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[Kludex]

please review

[kikones34]

What was the reasoning for this reversion? Without the fix, the MongoDsn validator produces invalid mongo URIs when given a mongo+srv URI.