Add docs, fix CSS selector, and add unit tests #3605

Job	Run time
changes	8s
test-dbt-versions (1.5)	1m 32s
test-dbt-versions (1.7)	1m 41s
test-dbt-versions (1.9)	1m 46s
test-dbt-versions (1.4)	1m 30s
test-dbt-versions (1.3)	1m 35s
test-dbt-versions (1.8)	1m 37s
test-dbt-versions (1.6)	1m 34s
test-dbt-versions (1.10)	1m 48s
test-vscode-e2e	0s
test-vscode	0s
cicd-tests-windows	9m 55s
doc-tests	42s
style-and-cicd-tests (3.11)	24m 21s
ui-test	1m 18s
migration-test	1m 37s
style-and-cicd-tests (3.9)	23m 50s
style-and-cicd-tests (3.12)	22m 42s
style-and-cicd-tests (3.10)	23m 23s
style-and-cicd-tests (3.13)	22m 54s
engine-tests-docker (mssql)	1m 40s
engine-tests-docker (spark)	5m 3s
engine-tests-docker (duckdb)	1m 47s
engine-tests-docker (mysql)	1m 44s
engine-tests-docker (clickhouse)	3m 10s
engine-tests-docker (risingwave)	2m 42s
engine-tests-docker (trino)	7m 55s
engine-tests-docker (postgres)	2m 49s
ui-style	-1s
engine-tests-cloud	0s
	2h 50m 42s

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