Search term args in inline expansion

[som-snytt]

Fixes #24894
Fixes #21881

Annotation args can be inline transparent, but Inlining phase doesn't inline into annotations.

The Inlined node must be handled when emitting the annotation and also when inspecting args.

Take a final val alias of a Java enum as a transparent inline def to preserve semantics.

Take @elidable(0) to mean "do not erase", as seen on chalkboards and whiteboards.

[som-snytt]

I'm glad the checks are green, but I had a local failure that final val was no longer stable in a pattern. I tossed in some StableRealizable and UncheckedStableAnnot but apparently that is not necessary. Probably I had a stale binary in .ivy2.

I wonder if there's a way for the test rig to warn me if a failure includes a suspicious artifact.

At the moment:

[error] -- [E046] Cyclic Error: /home/amarki/projects/scala3/staging/test/scala/quoted/staging/repl/StagingScriptedReplTests.scala:11:39
[error] 11 |class StagingScriptedReplTests extends ReplTest(ReplTest.withStagingOptions) {
[error]    |                                       ^
[error]    |                             Cyclic reference involving val <import>

I'm not going to investigate, but it would be nice if the test suite just ran (locally). Elsewhere, a PR includes tweaks to help run under JDK 25. Spurious warnings and errors are demoralizing and distracting.

I'll add a simple test for the stability check in patterns. (Bootstrapping would fail, as it did for me spuriously, if that were broken. It complained about the vals in concurrent.duration which are aliases of Java enums.) I'll also ask myself why it doesn't need more help with stability. The check is checkLegalValue in typer.