fix: Set DatabricksConnectionConfig to only use a shared_connection w… #3920

Job	Run time
changes	7s
test-dbt-versions (1.4)	1m 27s
test-dbt-versions (1.10)	1m 53s
test-dbt-versions (1.9)	1m 52s
test-dbt-versions (1.5)	1m 33s
test-dbt-versions (1.3)	1m 42s
test-dbt-versions (1.8)	1m 41s
test-dbt-versions (1.7)	1m 51s
test-dbt-versions (1.6)	1m 44s
test-vscode-e2e	-6s
test-vscode	-7s
migration-test	1m 27s
doc-tests	37s
ui-test	1m 24s
cicd-tests-windows	11m 30s
style-and-cicd-tests (3.11)	25m 12s
engine-tests-docker (mssql)	1m 46s
engine-tests-docker (duckdb)	1m 42s
engine-tests-docker (postgres)	2m 12s
style-and-cicd-tests (3.13)	22m 55s
style-and-cicd-tests (3.10)	22m 0s
engine-tests-docker (risingwave)	2m 52s
engine-tests-docker (trino)	8m 26s
engine-tests-docker (starrocks)	3m 19s
style-and-cicd-tests (3.12)	23m 23s
engine-tests-docker (clickhouse)	2m 38s
engine-tests-docker (spark)	5m 50s
engine-tests-docker (mysql)	1m 46s
style-and-cicd-tests (3.9)	23m 17s
ui-style	-1s
engine-tests-cloud (clickhouse-cloud)	14m 56s
engine-tests-cloud (snowflake)	10m 14s
engine-tests-cloud (fabric)	4m 55s
engine-tests-cloud (redshift)	5m 56s
engine-tests-cloud (databricks)	11m 21s
engine-tests-cloud (gcp-postgres)	3m 5s
engine-tests-cloud (athena)	22m 23s
engine-tests-cloud (bigquery)	14m 53s
	4h 23m 35s

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