Add changelog for 3.8.0-RC2

Signed-off-by: Wojciech Mazur <wmazur@virtuslab.com>

Author: WojciechMazur

changelogs/3.8.0-RC2.md

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+# Backported chnages
+
+- Upgrade ASM to 9.9 for JDK 26 support [#24430](https://github.com/scala/scala3/pull/24430)
+- Bump Scala CLI to 1.10.1 (was 1.10.0) [#24448](https://github.com/scala/scala3/pull/24448)
+- Add missing `-language:experimental.*` settings [#24513](https://github.com/scala/scala3/pull/24513)
+- Indicate deprecated option aliases [#24359](https://github.com/scala/scala3/pull/24359)
+- Fix #24456: Cleanup the info of a Bind symbol in posttyper [#24490](https://github.com/scala/scala3/pull/24490)
+- Ignore selection prototypes when typing type applications [#24489](https://github.com/scala/scala3/pull/24489)
+- Revert "do not patch the implicit scope of `scala.Unit` in Scala.js" [#24475](https://github.com/scala/scala3/pull/24475)
+- CheckUnused examines type of Apply [#24465](https://github.com/scala/scala3/pull/24465)
+- Have the correct properties when testing Scala.js [#24463](https://github.com/scala/scala3/pull/24463)
+- Make Java defined functions nullary when we override them [#24461](https://github.com/scala/scala3/pull/24461)
+- Add missing mapSourceURI for `scala-library-sjs` project [#24450](https://github.com/scala/scala3/pull/24450)
+- Allow to compile `scala.AnyVal` with Scala 3 [#24406](https://github.com/scala/scala3/pull/24406)
+
+# Contributors
+
+Thank you to all the contributors who made this release possible 🎉
+
+According to `git shortlog -sn --no-merges 3.8.0-RC1..3.8.0-RC2` these are:
+
+```
+     7  Hamza Remmal
+     4  Wojciech Mazur
+     2  Martin Odersky
+     2  Som Snytt
+     1  Piotr Chabelski
+     1  Seth Tisue
+     1  noti0na1
+```