Gate the setting of `url.full`and `http.query` within ASGI middleware behind the PII flag

[ericapisani]

Within the _asgi_common.py file, for streamed spans, there's a couple of attributes that are considered PII that we're not gating behind the appropriate flag.

Update this function to not set these attributes if should_send_default_pii is set to False

[linear-code]

PY-2514