pytest: improvements for suitable curl and error output

- will check built curl for http and https support and
  skip all tests if not there
- will dump stdout/stderr/trace output on errored responses

Closes #10829

tests/http/testenv/env.py

@@ -237,6 +237,11 @@ class Env:
     def curl_has_feature(feature: str) -> bool:
         return feature.lower() in Env.CONFIG.curl_props['features']
 
+    @staticmethod
+    def curl_has_protocol(protocol: str) -> bool:
+        return protocol.lower() in Env.CONFIG.curl_props['protocols']
+
+
     @staticmethod
     def curl_lib_version(libname: str) -> str:
         prefix = f'{libname.lower()}/'