move quickstart_snowflake back to mono repo

[yuhan]

Summary & Motivation

move https://github.com/dagster-io/quickstart-snowflake (exactly the same) back to example.

next:

• change repository -> definitions in all the quickstart ones
• update cloud nux backend to clone from oss examples dir

How I Tested These Changes

local dagit can load

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2 Ignored Deployments

Name	Status	Preview	Comments	Updated
dagit-storybook	⬜️ Ignored (Inspect)			Dec 15, 2022 at 1:48AM (UTC)
dagster	⬜️ Ignored (Inspect)			Dec 15, 2022 at 1:48AM (UTC)

[yuhan]

Current dependencies on/for this PR:

• master
  • PR update assets_modern_data_stack example readme #11122
    • PR move quickstart_aws back to mono repo #11130
      • PR move quickstart_gcp back to mono repo #11131
        • PR move quickstart_snowflake back to mono repo #11132 👈
          • PR convert-examples-repo-to-defs cloud nux quickstart_aws #11135
            • PR convert-examples-repo-to-defs cloud nux quickstart_gcp #11136
              • PR convert-examples-repo-to-defs cloud nux quickstart_snowflake #11137
    • PR update assets_dbt_python example readme #11126

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