Embed sdk versions (#68)

Part of https://github.com/pulumi/ci-mgmt/issues/915

Install pulumi in standard way 

Use the same method as other providers to install the pulumi CLI.
- Lock the version of the CLI and therefore codegen for consistent build
results.
- Ensure the local language plugins are using by disabling ambient
plugins.

Enable respect schema version

Remove setting version at SDK build time

---------

Co-authored-by: Bryce Lampe <bryce@pulumi.com>

sdk/python/pulumi_docker_build/pulumi-plugin.json

@@ -1,4 +1,5 @@
 {
   "resource": true,
-  "name": "docker-build"
+  "name": "docker-build",
+  "version": "1.0.0-alpha.0+dev"
 }