Make SIP-62 `better-fors` a stable feature #164

Job	Run time
tasty-core-nonbootstrapped	1m 2s
scala3-sbt-bridge-nonbootstrapped	3m 6s
scala3-compiler-nonbootstrapped	3m 53s
scala-library-nonbootstrapped	55s
scala3-library-nonbootstrapped	57s
scala3-library-bootstrapped	4m 17s
tasty-core-bootstrapped	3m 58s
scala3-staging	5m 57s
scala3-tasty-inspector	6m 40s
test-scala3-sbt-bridge-bootstrapped	5m 32s
scala3-sbt-bridge-bootstrapped	5m 20s
test-tasty-core-bootstrapped	4m 4s
test-tasty-core-nonbootstrapped	1m 3s
scala3-compiler-bootstrapped	5m 39s
test-scala3-sbt-bridge-nonbootstrapped	3m 23s
scala-library-bootstrapped	3m 58s
	59m 44s

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