Clean up and format dbt test workbook

[jeancochrane]

This PR makes a number of quality-of-life improvements to the dbt test workbook that gets output by the .github/scripts/format_dbt_test_failures.py script. It is the basis of the workbook that was sent over to the rest of the internal stakeholders for review.

Improvements include:

• Adds a test caching system to speed up workbook development
• Writes test results using a write-only openpyxl workbook in order to reduce memory use
• Adds groupings for worksheet columns, with dedicated colors and top-level headers
• Adds support for a new test_qc_exclude_from_workbook tag that can be used to exclude certain tests or models
• Adds a few missing descriptions and columns for failing tests

Changes were tested by generating the workbook with the following commands run in the dbt/ subdirectory:

dbt test --select test_qc_* --exclude test_qc_exclude_from_workbook --store-failures
python3 ../.github/scripts/format_dbt_test_failures.py

Closes https://github.com/ccao-data/data-architecture/issues/288.

[jeancochrane]

I left some responses to your questions @dfsnow, this is probably worth one more look just to make sure we're on the same page!

[dfsnow]

I left some responses to your questions @dfsnow, this is probably worth one more look just to make sure we're on the same page!

I think we're set to go! Let's merge