Revert http-177 and allow user to specify http version on lookup httprequests.

[davidradl]

#178 was added incorrectly, it changed the sink version from 1.1 to 2. The intent was actually to solve a problem talking to langflow webhooks. Where we were getting
Invalid HTTP request received
HTTP/2 upgrade not supported

• In the http connector - the existing lookup http client and request calls do not specify a version on the HttpClient or HttpRequest 
• In the http connector - the sink http requests for batch and per request was HTTP_1_1, I recently changed this to HTTP_2 in HTTP-177
• Running the http connector with a lookup against a langflow flow with /run/ in the base URL. This works in curl and with the http connector 
• Running the http connector with a lookup against a langflow flow with a webhook, exposes an API containing with /webhook/ in the base URL.
  • This works in curl and fails with the reported error using the http client. 
  • If I change the http connector so the httprequest has version HTTP_1_1 version, it works.

Proposed changes:

the recent change to http connector sink - was not correct and when I tested it - my test was not driving the fix . We need to

• revert the sink HTTPRequest to HTTP_1_1, at least.
• change the lookup connector to allow HTTP_1_1 to be specified. Introduce a new config for lookup with enumerations none, 1.1 and 2.