Revert "Include Beam version details in MongoDB handshake (#36949)"

This reverts commit f242a88.

Author: Abacn

sdks/python/apache_beam/io/mongodbio.py

@@ -97,7 +97,6 @@
   from pymongo import DESCENDING
   from pymongo import MongoClient
   from pymongo import ReplaceOne
-  from pymongo.driver_info import DriverInfo
 except ImportError:
   objectid = None
   json_util = None
@@ -106,7 +105,6 @@
   DESCENDING = -1
   MongoClient = None
   ReplaceOne = None
-  DriverInfo = None
   _LOGGER.warning("Could not find a compatible bson package.")
 
 __all__ = ["ReadFromMongoDB", "WriteToMongoDB"]
@@ -264,10 +262,6 @@ def __init__(
     self.projection = projection
     self.spec = extra_client_params
     self.bucket_auto = bucket_auto
-    self.client = MongoClient(
-        self.uri,
-        **self.spec,
-        driver=DriverInfo("Apache Beam", beam.__version__))
 
     if "driver" not in self.spec:
       self.spec["driver"] = DriverInfo(