Integration workflow update to support all-in-one adapter testing

[gshank]

resolves #

See discussion and reviews on https://github.com/dbt-labs/dbt-snowflake/pull/1149

Problem

Solution

Checklist

• [ ] I have read the contributing guide and understand what's expected of me
• [ ] I have run this code in development and it appears to resolve the stated issue
• [ ] This PR includes tests, or tests are not required/relevant for this PR
• [ ] This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX