[SPIKE- DO NOT MERGE]Adds venv sh from cloud

[racheldaniel]

What is this PR?

This is a:

• [ ] documentation update
• [ ] bug fix with no breaking changes
• [ ] new functionality
• [ ] a breaking change

All pull requests from community contributors should target the main branch (default).

Description & motivation

This is just a spike to show POC for using venv cache for dbt-server. We don't want to do this on the public repo at this time, as the SL workspaces will need to continue to use the old image building method unless updated in runtime gateway (they will likely use the old images until the SL is replatformed)

Checklist

• [ ] I have verified that these changes work locally on the following warehouses (Note: it's okay if you do not have access to all warehouses, this helps us understand what has been covered)
  • [ ] BigQuery
  • [ ] Postgres
  • [ ] Redshift
  • [ ] Snowflake
  • [ ] Databricks
  • [ ] Spark
• [ ] I have updated the README.md (if applicable)
• [ ] I have added tests & descriptions to my models
• [ ] I have added an entry to CHANGELOG.md

[github-actions[bot]]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.