Fix connection recovery from uri when host has protocol

[amoghrajesh]

While working on #51930, realised that connections cannot recover using the uri of the same connection when hosts have protocols.

Example:

from airflow.models import Connection
Connection(conn_id="default_port", conn_type="http", host="http://host/")
Out[13]: default_port
x = Connection(conn_id="default_port", conn_type="http", host="http://host/")
x
Out[15]: default_port
x.host
Out[16]: 'http://host/'
x.as_json()
Out[17]: '{"conn_type": "http", "host": "http://host/"}'
x.get_uri()
Out[18]: 'http://host/'
y = Connection(uri=x.get_uri())
y.host
Out[20]: 'host'

This should not be the case, information should be preserved (as_json does it)

After fix:

from airflow.models import Connection
x = Connection(conn_id="default_port", conn_type="http", host="http://host")
x.as_json()
Out[5]: '{"conn_type": "http", "host": "http://host"}'
x.host
Out[6]: 'http://host'
y = Connection(uri=x.get_uri())
y.host
Out[8]: 'http://host'

We have enough test coverage in test_get_uri and related methods.

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[potiuk]

Nice one!

[amoghrajesh]

@ashb I am merging this. Let me know if you are unhappy with the connection type. I will fix it