Change default PushType; remove MongoConfig and rely on Push inputs

[alelom]

Issues addressed by this PR

Closes #93 Closes #150

The default Push behaviour is now to "append", while you need to set the PushType to DeleteThenCreate to "replace". The MongoConfig has been deleted, as it's redundant.

Test files

Try any existing script, e.g. https://burohappold.sharepoint.com/:f:/s/BHoM/ElPtUXgB2_pEvRhg7WfRuvEBlaP93pGBZ_zPeWvWpTYtYQ?e=X8HQEI

Changelog

• The default Push behaviour is now to "append"; you need to set the PushType to DeleteThenCreate to "replace", and any other PushType results in appending.
• The MongoConfig has been deleted as redundant. When Pushing, the tag is accessible through the Push inputs, and the behaviour obtained through the replace boolean can be replicated by setting the PushType. When doing Execute, the replace boolean in the MongoConfig was already not used, as it was substituted for the boolean available in the Transfer command a while ago.

[alelom]

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[FraserGreenroyd]

Having discussed with @alelom and am merging to continue testing via alphas over the weekend/early next week. Things we want to ensure are still working with this update will include analytics scraping, bot operations, and other existing uses of Mongo Toolkit in operation. FYI @adecler @michaelhoehn @IsakNaslundBh