Update DBT image (ephemeral model to materialized tables)

[amishas157]

PR Checklist

PR Structure

• This PR has reasonably narrow scope (if not, break it down into smaller PRs).
• This PR avoids mixing refactoring changes with feature changes (split into two PRs
  otherwise).
• This PR's title starts with the jira ticket associated with the PR.

Thoroughness

• This PR adds tests for the most critical parts of the new functionality or fixes.
• I've updated the README with the added features, breaking changes, new instructions on how to use the repository.

What

This PR updates DBT image. Context below from DBT PR

While auditing the tests for DBT, it was found out that tests for intermediate models int_trade_agg* will take ~300 seconds in prod. This was because it will create ephemeral model for each test and then run the test.
This PR updates the intermediate tables to be materialized rather than being ephemeral.

Why

Improve test run time in int_trade_agg* models.

Known limitations

None