Fix schema name generation for branch names with forward slashes #3499

Job	Run time
test (1.8.0, postgres) / test	50s
test (latest_official, redshift) / test	41s
test (latest_official, clickhouse) / test	55s
test (latest_pre, postgres) / test	40s
test (latest_official, trino) / test	1m 3s
test (latest_official, bigquery) / test	56s
test (latest_official, snowflake) / test	39s
test (latest_official, athena) / test	1m 0s
test (latest_official, postgres) / test	47s
test (latest_official, databricks_catalog) / test	1m 1s
Notify Slack	0s
	8m 32s

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