Fixed failing Tests due to missing Custom Node.

<h4>Summary</h4>
Below tests were failing due to missing custom node and Why those were missing custom node, is because we don't have installed version of Dynamo on EC and that is the reason it will not able to find Custom node in the following path .C:\ProgramData\Dynamo\0.7\definitions and it fails.

<h4>Solution</h4>
I have copied their required .dyf files to their test directory, so now when dyn file loads it is finding custom node correctly. Now below tests are started passing
* Attractor_1
* RefGridSlidersSample
* TestMigration_Analyze_Measure

Below test need more investigation as it is throwing exception while running expression.
* TestMIgration_Geometry_Point

Below test deleted because it was testing migration of Nodes form Experimental Geometry which we do nto support.
*  TestMigration_Geometry_Experimental

<h4>Reviewer</h4>
- [ ] @ikeough 
- [ ] @Randy-Ma 

<h4>Need Cherry Pick</h4>
- [ ] Master