Remove the TemporaryWorkspace entirely from the RemoteWorkspace code.

[CyrusNajmabadi]

This type existed for a couple of reasons that no longer are valid anymore.

First, we used to have a key/value persistence store that features assumed they could write/read from in isolation. This would break in OOP if multiple calls were made to the same workspace and the features wrote/read from teh same keys. different features would see the results of other calls while they were in flight. In particular, this broke Diagnostics, which would persist out data and assume it could read it back without anything else being involved. However, a while back we both removed persistence of data from Diagnostics, and we also removed teh general key/value store entirely (now we only have a checksummed key/value store, where all clients must only use it as a speedup/cache, and cannot assume anything beyond that if something exists with teh same checksum, then it has the same data).

Second, we would share an options service across all calls, meaning if one call came in and mutated options, then that would impact other calls at the same time that wanted different options. All our work to make it so that oop features pass along the options they want as data makes this now unnecessary.

[tmat]