enable concurrent tests on same target warehouse

[dataders]

even though matrix testing is available. it can't run concurrently because ostensibly two tests against the same DWH would collide: e.g. testing dbt-redshift==1.6.0 and dbt-redshift==1.70. Neither can two PRs run CI against the same warehouse concurrently

This is because the schema is hardcoded. It should instead by dynamic with perhaps generated GHA-run-id-related.

However this requires also doing #171 and #272

dbt-external-tables/integration_tests/ci/sample.profiles.yml

Line 20 in 383ee3c

schema: dbt_external_tables_integration_tests_redshift

[github-actions]

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