Fix: Don't rewrite_casts for for subclasses like JSONCast (#5805) #3642

Job	Run time
changes	6s
test-dbt-versions (1.8)	2m 6s
test-dbt-versions (1.7)	1m 37s
test-dbt-versions (1.4)	1m 27s
test-dbt-versions (1.9)	1m 44s
test-dbt-versions (1.6)	1m 36s
test-dbt-versions (1.3)	1m 36s
test-dbt-versions (1.5)	1m 30s
test-dbt-versions (1.10)	1m 45s
test-vscode	0s
test-vscode-e2e	0s
migration-test	1m 26s
doc-tests	37s
ui-test	1m 24s
style-and-cicd-tests (3.13)	20m 6s
style-and-cicd-tests (3.10)	22m 10s
style-and-cicd-tests (3.11)	22m 1s
cicd-tests-windows	10m 53s
style-and-cicd-tests (3.9)	19m 51s
style-and-cicd-tests (3.12)	23m 37s
engine-tests-docker (duckdb)	1m 38s
engine-tests-docker (spark)	5m 10s
engine-tests-docker (mssql)	1m 54s
engine-tests-docker (trino)	8m 16s
engine-tests-docker (mysql)	1m 28s
engine-tests-docker (clickhouse)	2m 53s
engine-tests-docker (postgres)	2m 36s
engine-tests-docker (risingwave)	2m 34s
ui-style	0s
engine-tests-cloud (fabric)	5m 19s
engine-tests-cloud (bigquery)	14m 48s
engine-tests-cloud (redshift)	7m 11s
engine-tests-cloud (snowflake)	9m 22s
engine-tests-cloud (clickhouse-cloud)	9m 54s
engine-tests-cloud (athena)	19m 29s
engine-tests-cloud (gcp-postgres)	4m 36s
engine-tests-cloud (databricks)	11m 54s
	4h 4m 34s

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