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/BasicTemplateForexAlgorithm.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");
@@ -11,19 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from clr import AddReference
-AddReference("System")
-AddReference("QuantConnect.Algorithm")
-AddReference("QuantConnect.Indicators")
-AddReference("QuantConnect.Common")
-
-from System import *
-from QuantConnect import *
-from QuantConnect.Data import *
-from QuantConnect.Algorithm import *
-from QuantConnect.Indicators import *
-from datetime import timedelta
-import numpy as np
+from AlgorithmImports import *
 
 ### <summary>
 ### Algorithm demonstrating FOREX asset types and requesting history on them in bulk. As FOREX uses
@@ -62,4 +50,4 @@ class BasicTemplateForexAlgorithm(QCAlgorithm):
     def OnData(self, data):
         # Print to console to verify that data is coming in
         for key in data.Keys:
-            self.Log(str(key.Value) + ": " + str(data.Time) + " > " + str(data[key].Value))
+            self.Log(str(key.Value) + ": " + str(data.Time) + " > " + str(data[key].Value))