Backport "Reimplement support for type aliases in SAM types" to 3.3.4 #21553
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This was dropped in scala#18201 which restricted SAM types to valid parent types, but it turns out that there is code in the wild that relies on refinements being allowed here. To support this properly, we had to enhance ExpandSAMs to move refinements into type members to pass Ycheck (previous Scala 3 releases would accept the code in tests/run/i18315.scala but fail Ycheck). Fixes scala#18315.
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Backports #18317 to 3.3.4-RC2 LTS. The PR fixes a regression introduced in 3.3.2