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Remove deprecated v1 Subsystem facilities (#11424)

### Problem

As initiated in #11388, the v1 `Subsystem.{global_instance,scoped_instance}()` facilities are being removed.

### Solution

Remove `Subsystem.{global_instance,scoped_instance}()` and their support code. To reduce bootstrap dependencies, the `RunTracker` is no longer a `Subsystem`: its options have moved to being global options, and are deprecated in their previous locations. The `--streaming-workunit-handlers` option (which relied on singleton `Subsystem`s) is also removed in favor of the APIs added in #11388.

### Result

Plugins that need access to `Subsystem`s should do so via `@rule` arguments, and callers outside of `@rule`s should use `Scheduler.product_request(<subsystem_cls>, [Params()])` to get an instance.

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