Added `group` properties to dbt_project.yml files #117

Job	Run time
validate-json-schemas	17s
validate_plusless_properties	8s
test-against-sample-dbt-files (1.5, dbt_project)	11s
test-against-sample-dbt-files (1.5, packages)	13s
test-against-sample-dbt-files (1.5, selectors)	8s
test-against-sample-dbt-files (1.5, dbt_yml_files)	8s
test-against-sample-dbt-files (1.6, dbt_project)	11s
test-against-sample-dbt-files (1.6, packages)	8s
test-against-sample-dbt-files (1.6, selectors)	8s
test-against-sample-dbt-files (1.6, dbt_yml_files)	14s
test-against-sample-dbt-files (1.6, dependencies)	15s
	2m 1s

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