R1:0692115953fa

Remove all references to the Conduit ConnectionLog

Summary:
Ref T5955, T9980, T9982.

We currently store two types of Conduit logs: //connection// logs and //method// logs.

Originally, Conduit worked like web logins: you'd call `conduit.connect` and then get a session back. This approach still works, but new clients don't use it and it will probably stop working eventually after T5955 is further along.

There was no real reason for things to work like this and no other API in the world does, I think it…