Fix (databricks): use shared connection pool to prevent OAuth CSRF ra… #3599

Job	Run time
test-dbt-versions (1.5)	1m 31s
test-dbt-versions (1.10)	2m 0s
test-dbt-versions (1.4)	1m 32s
test-dbt-versions (1.9)	1m 41s
test-dbt-versions (1.6)	1m 53s
test-dbt-versions (1.7)	1m 41s
test-dbt-versions (1.8)	1m 37s
test-vscode-e2e	0s
test-dbt-versions (1.3)	1m 44s
changes	6s
test-vscode	-1s
doc-tests	38s
migration-test	2m 7s
style-and-cicd-tests (3.10)	26m 0s
cicd-tests-windows	11m 40s
engine-tests-docker (duckdb)	1m 28s
engine-tests-docker (trino)	8m 1s
engine-tests-docker (postgres)	2m 24s
style-and-cicd-tests (3.9)	24m 26s
style-and-cicd-tests (3.11)	23m 20s
style-and-cicd-tests (3.12)	23m 23s
engine-tests-docker (clickhouse)	2m 55s
engine-tests-docker (risingwave)	2m 38s
engine-tests-docker (spark)	5m 5s
style-and-cicd-tests (3.13)	23m 10s
engine-tests-docker (mssql)	1m 49s
engine-tests-docker (mysql)	1m 44s
ui-test	1m 22s
ui-style	-1s
engine-tests-cloud (athena)	20m 28s
engine-tests-cloud (redshift)	5m 35s
engine-tests-cloud (bigquery)	16m 23s
engine-tests-cloud (snowflake)	12m 18s
engine-tests-cloud (fabric)	4m 41s
engine-tests-cloud (databricks)	12m 14s
engine-tests-cloud (gcp-postgres)	4m 41s
engine-tests-cloud (clickhouse-cloud)	10m 30s
	4h 22m 43s

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