store_failures_as missing from project schema

[vonbraunbates]

The v1.7 and latest project schemas are missing valid values for store_failures_as. Since this was valid from v1.7 onwards, it's correct to be missing in v1.5 and v1.6.

This causes a validation error (e.g. using v8r):

Validating ./dbt_project.yml against schema from https://raw.githubusercontent.com/dbt-labs/dbt-jsonschema/main/schemas/latest/dbt_project-latest.json ...
✖ ./dbt_project.yml is invalid

./dbt_project.yml#/tests/+store_failures_as must be object
./dbt_project.yml#/tests/+store_failures_as must be null
./dbt_project.yml#/tests/+store_failures_as must match exactly one schema in oneOf

According to the docs:

The three supported values are:
ephemeral — nothing stored in the database (default)
table — test failures stored as a database table
view — test failures stored as a database view
You can configure it in all the same places as store_failures, including singular tests (.sql files), generic tests (.yml files), and dbt_project.yml.

Are there files for validating singular tests that I should also check for this bug?