RDS for Postgres 14+
does come with pg_tle, but it does not come with pgsql-http, so you cannot use the dbdev installer. But, you
can still install TLEs, you just have to do so "by hand" by calling `pgtle.install_extension()` yourself, probably from a migration script depending on your tooling.
See the RDS docs here: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Postg...