There were a load of warnings such as the below, when building the
protobufs:
```
warning: Import google/protobuf/empty.proto is unused.
```
This removes the unused imports.
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# Description
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Fixes https://github.com/pulumi/pulumi/issues/14532.
14532 was just for Remote and Component, but since raising that we've
added LogicalName as well so this PR also adds support for that.
## Checklist
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Updates the node SDK to have types for the generated protobufs and grpc
services. No more `any`.
I don't think these types show up on any user facing parts of the SDK.
The two places they could show up are the mock monitor (but I've left
that as any for now) and the provider interfaces (which I've also left
alone for now).
But this fixes up most of our sdk internal code to have types, which
flagged a couple of oddities like assuming `Input<string>` was `string`
in the alias code, and a whole load of missing undefined checks.