[BUG] Generate Sources in BigQuery with same table name (different cases)

[smenendez19]

Describe the bug
When i use dbt-coves generate sources in a dbt project with BigQuery and i create models for 2 tables with the same name but different cases, the function only returns one of the models and overwrites the other.

To Reproduce
Steps to reproduce the behaviour:

1. Create in BigQuery two tables with the same name, one with lowercase and the other with uppercase.
2. Execute dbt-coves generate sources for the BigQuery dbt project
3. In the CLI, select both tables that you created
4. dbt-coves create the models for the two tables, but only returns one of the models and the other overwrites.

Console Log/Tracebacks

• OS: Ubuntu
• Version: dbt-coves v1.3.0-alpha.8

[BAntonellini]

Fixed in PR #309

Now you can't select two tables with the same name on the same schema