Refactor python algorithm import (#5657)

* Python research import improvements

- Improve start.py for research env
- Remove unrequired imports

* Centralize algorithm imports

* Add regression test GH action

* Unit test python import clean up

* Join research and main imports

* More python import clean up

* Fix failing skipped regression algorithm

Algorithm.Python/UpdateOrderRegressionAlgorithm.py

@@ -1,4 +1,4 @@
-# QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+# QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
 # Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -11,22 +11,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from clr import AddReference
-AddReference("System.Core")
-AddReference("System.Collections")
-AddReference("QuantConnect.Algorithm")
-AddReference("QuantConnect.Common")
-
-from System import *
-from System.Linq import *
-from QuantConnect import *
-from QuantConnect.Algorithm import *
-from QuantConnect.Data import *
-from QuantConnect.Orders import *
-from QuantConnect.Securities import *
-from QuantConnect.Util import *
+from AlgorithmImports import *
 from math import copysign
-from datetime import datetime
 
 ### <summary>
 ### Provides a regression baseline focused on updating orders
@@ -134,4 +120,4 @@ class UpdateOrderRegressionAlgorithm(QCAlgorithm):
             self.Log("FILLED:: {0} FILL PRICE:: {1}".format(self.Transactions.GetOrderById(orderEvent.OrderId), orderEvent.FillPrice))
         else:
             self.Log(orderEvent.ToString())
-            self.Log("TICKET:: {0}".format(ticket))
+            self.Log("TICKET:: {0}".format(ticket))