[fuchsia] Migrate to new RealmBuilder API (#39205) See https://fxrev.dev/793422. Missed in d85ec02b0d25f8b3c2a45d1879846bbe9d19ab33, ade610ec88b550ccef5f25b169d574f3fe15a3ab and 6fe9861be30f8fa0ec2afea893d8a8acc6276f77.
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