Remove unused ScriptedLoadableModule features

[allemangD]

One of the nitpick issues mentioned in Slicer/ExtensionsIndex#2006 (review)

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Logic classes are CondaSetUpCall and CondaSetUpCallWsl. CondaSetUpLogic is unused, so remove it.

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Parameter node is unused - conda settings are persisted in Qt Application settings. I believe this is a correct choice: no conda options should be persisted with the Slicer scene. So remove the logic around parameter node and wrapper.

• def initializeParameterNode
• def setParameterNode
• Logic in exit()
• Logic in enter()
• Logic in onSceneStartClose
• Logic in onSceneEndClose
• class CondaSetUpParameterNode

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Sample data is not used, so remove the sample data from the extension template

• def registerSampleData
• Logic in class CondaSetUp