ci: set up validation test

[lidavidm]

What's Changed

Use the existing CI environment.

[lidavidm]

Hi @jadewang-db @eric-wang-1990 as discussed in December, this sets up testing of the Databricks driver using the existing CI secrets. It appears the tests hang currently, so we'll keep working on this, but just a heads up here.

[Mandukhai-Alimaa]

This should be "main" and "adbc_testing"?

[lidavidm]

CC @Mandukhai-Alimaa

FAILED validation/tests/test_connection.py::TestConnection::test_get_objects_column_not_exist[databricks:17] - adbc_driver_manager.InternalError: INTERNAL: failed to query tables with columns: databricks: execution error: failed to execute query: unexpected operation state ERROR_STATE: [TABLE_OR_VIEW_NOT_FOUND] The table or view `hive_metastore`.`information_schema`.`COLUMNS` cannot be found. Verify the spelling and correctness of the schema and catalog.
If you did not qualify the name with a schema, verify the current_schema() output, or qualify the name with the correct schema and catalog.
To tolerate the error on drop use DROP VIEW IF EXISTS or DROP TABLE IF EXISTS. SQLSTATE: 42P01; line 1 pos 97

Maybe we can merge this and work on the long tests and this error? (Maybe hive_metastore has a different information_schema?)

[Mandukhai-Alimaa]

@lidavidm, yes lets merge this in, and I will make a separate PR for the long tests and this error.

[lidavidm]

@amoeba I need your approval to merge 😅

[amoeba]

Done!