Allow LROPoller typing to accept the return type as a type argument

[iscai-msft]

This way, in typing I can have # type: (...) -> LROPoller[return type] instead of just -> LROPoller.

Currently, when adding the return type as a type argument, I get this error: "LROPoller" expects no type arguments, but 1 given

[lmazuel]

Should look like this:

azure-sdk-for-python/sdk/core/azure-core/azure/core/pipeline/policies/_base.py

Lines 48 to 53 in 98e00dd

	HTTPResponseType = TypeVar("HTTPResponseType")
	HTTPRequestType = TypeVar("HTTPRequestType")
	_LOGGER = logging.getLogger(__name__)
	class HTTPPolicy(ABC, Generic[HTTPRequestType, HTTPResponseType]): # type: ignore

[rakshith91]

Fixed in #10653