Fix: Don't rewrite_casts for for subclasses like JSONCast #3639

Job	Run time
changes	7s
test-dbt-versions (1.3)	1m 37s
test-dbt-versions (1.4)	1m 31s
test-dbt-versions (1.8)	1m 38s
test-dbt-versions (1.9)	1m 54s
test-dbt-versions (1.6)	1m 37s
test-dbt-versions (1.7)	1m 42s
test-dbt-versions (1.5)	1m 31s
test-dbt-versions (1.10)	1m 50s
test-vscode-e2e	-1s
test-vscode	-1s
cicd-tests-windows	11m 35s
style-and-cicd-tests (3.12)	14m 5s
doc-tests	32s
migration-test	1m 30s
style-and-cicd-tests (3.11)	24m 16s
style-and-cicd-tests (3.9)	23m 12s
style-and-cicd-tests (3.10)	24m 22s
style-and-cicd-tests (3.13)	21m 52s
engine-tests-docker (mssql)	1m 47s
engine-tests-docker (postgres)	2m 44s
engine-tests-docker (risingwave)	2m 46s
engine-tests-docker (duckdb)	1m 36s
engine-tests-docker (clickhouse)	2m 58s
engine-tests-docker (trino)	7m 59s
engine-tests-docker (mysql)	1m 35s
engine-tests-docker (spark)	5m 32s
ui-style	0s
ui-test	0s
engine-tests-cloud	0s
	2h 41m 46s

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