Add changelog for 3.7.0-RC2

Author: WojciechMazur

Diff for: changelogs/3.7.0-RC2.md

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+# Backported changes
+
+- Backport "Check trailing blank line at EOF for OUTDENT" to 3.7.0 [#22942](https://github.com/scala/scala3/pull/22942)
+- Backport "Fail compilation if multiple conflicting top-level private defs/vals are in the same package" to 3.7 [#22932](https://github.com/scala/scala3/pull/22932)
+- Backport "Deprecate `Yno-kind-polymorphism`" to 3.7 [#22931](https://github.com/scala/scala3/pull/22931)
+- Backport "Revert unconditional lint of Inlined expansion" to 3.7 [#22930](https://github.com/scala/scala3/pull/22930)
+- Backport "Bump Scala CLI to v1.7.1 (was v1.7.0)" to 3.7 [#22929](https://github.com/scala/scala3/pull/22929)
+- Backport "Fix #22794: Emit the definition of Arrays.newArray even though it's a primitive." to 3.7.0 [#22801](https://github.com/scala/scala3/pull/22801)
+
+# Reverted changes
+
+- Revert "Make overload pruning based on result types less aggressive" in 3.7.0 [#22940](https://github.com/scala/scala3/pull/22940)
+
+# Contributors
+
+Thank you to all the contributors who made this release possible 🎉
+
+According to `git shortlog -sn --no-merges 3.7.0-RC1..3.7.0-RC2` these are:
+
+```
+     4  Som Snytt
+     4  Wojciech Mazur
+     1  Jan Chyb
+     1  Piotr Chabelski
+     1  Sébastien Doeraene
+     1  Yichen Xu
+```