Fixed dbt Cloud's breaking change environment variable. #3279

Job	Run time
test (latest_pre, databricks) / test	1m 12s
test (latest_pre, athena) / test	28m 14s
test (latest_pre, databricks_catalog) / test	1m 9s
test (latest_pre, bigquery) / test	19m 18s
test (1.3.0, postgres) / test	23m 6s
test (latest_pre, postgres) / test	13m 3s
test (latest_pre, redshift) / test	23m 43s
test (latest_pre, snowflake) / test	5h 57m 33s
test (latest_pre, trino) / test	20m 4s
Notify Slack	0s
	8h 7m 22s

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