UPSOLVER: Documentation for features in v1.5.27 of dbt-upsolver (#4007)

## What are you changing in this pull request and why?
<!---
Version v1.5.27 of dbt-upsolver introduced access to new features and
updates to options for dbt-upsolver. These changes reflected in the
documentation update hereby.
-->

## Checklist

- [X] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
and [About
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
so my content adheres to these guidelines.