* Propagate workspace.Project metadata to plugin init
* Get to a working fix
* Propagate Root via plugin context
* Propagate root instead of yaml path
* Revert out unnecessary parameter propagation
* Root is now always absolute at this point; simplify code and docs
* Drop python conditional and propagate unused -root to all lang hosts
* Add tests that fail before and pass after
* Lint
* Add changelog entry
- Add component ref coverage to the existing test
- Add coverage for a downlevel SDK communicating with an engine that
supports resource refs
- Add coverage for a downlevel engine communicating with an SDK that
supports resource refs
As part of improving coverage, these changes add a knob to explicitly
disable resource refs in the engine without the use of the environment
variable. The environment variable is now only read by the CLI, and has
been restored to its prior polarity (i.e. `PULUMI_ENABLE_RESOURCE_REFERENCES`).
This name better suits the semantics of the type, and aligns with the
rename of deploy.Plan to deploy.Deployment. These changes also refactor
the `update` method s.t. previews and updates are more consistent in
their behavior (e.g. duration and resource changes are now reported for
both, incl. on error paths).
