fix(dialect): make extend_sqlglot idempotent #4012

Job	Run time
changes	8s
test-dbt-versions (1.3)	1m 43s
test-dbt-versions (1.7)	2m 0s
test-dbt-versions (1.6)	1m 28s
test-dbt-versions (1.8)	1m 53s
test-dbt-versions (1.10)	2m 4s
test-dbt-versions (1.9)	1m 47s
test-dbt-versions (1.5)	1m 41s
test-dbt-versions (1.4)	1m 41s
test-vscode	-1s
test-vscode-e2e	-1s
migration-test	1m 29s
cicd-tests-windows	10m 39s
doc-tests	43s
style-and-cicd-tests (3.13)	25m 23s
style-and-cicd-tests (3.12)	19m 42s
style-and-cicd-tests (3.9)	23m 48s
style-and-cicd-tests (3.11)	23m 38s
style-and-cicd-tests (3.10)	24m 37s
engine-tests-docker (duckdb)	1m 44s
engine-tests-docker (postgres)	2m 53s
engine-tests-docker (mssql)	2m 7s
engine-tests-docker (starrocks)	2m 58s
engine-tests-docker (mysql)	1m 59s
engine-tests-docker (spark)	5m 55s
engine-tests-docker (trino)	10m 15s
engine-tests-docker (clickhouse)	3m 9s
engine-tests-docker (risingwave)	2m 55s
ui-test	0s
ui-style	0s
engine-tests-cloud	-1s
	2h 58m 16s

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