fix(dialect): make extend_sqlglot idempotent #4081

Job	Run time
changes	6s
test-dbt-versions (1.8)	1m 47s
test-dbt-versions (1.6)	1m 47s
test-dbt-versions (1.4)	1m 32s
test-dbt-versions (1.7)	1m 42s
test-dbt-versions (1.5)	1m 35s
test-dbt-versions (1.10)	1m 48s
test-dbt-versions (1.9)	1m 49s
test-dbt-versions (1.3)	1m 40s
test-vscode	0s
test-vscode-e2e	0s
cicd-tests-windows	13m 15s
doc-tests	41s
style-and-cicd-tests (3.11)	19m 14s
migration-test	1m 29s
style-and-cicd-tests (3.9)	25m 24s
style-and-cicd-tests (3.10)	25m 39s
style-and-cicd-tests (3.13)	23m 9s
engine-tests-docker (postgres)	2m 18s
engine-tests-docker (spark)	5m 11s
engine-tests-docker (clickhouse)	2m 48s
style-and-cicd-tests (3.12)	23m 47s
engine-tests-docker (risingwave)	2m 43s
engine-tests-docker (mysql)	1m 48s
engine-tests-docker (duckdb)	1m 40s
engine-tests-docker (trino)	8m 18s
engine-tests-docker (starrocks)	3m 27s
engine-tests-docker (mssql)	1m 48s
ui-test	0s
ui-style	0s
engine-tests-cloud	0s
	2h 56m 25s

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