Add changelog for release 3.7.2-RC1

Author: WojciechMazur

changelogs/3.7.2-RC2.md

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+# Backported chnages
+
+- Backport "Bump Scala CLI to v1.8.4 (was v1.8.1)" to 3.7.2 [#23547](https://github.com/scala/scala3/pull/23547)
+- Backport "Use result of lambda type of implicit in CheckUnused" to 3.7.2 [#23545](https://github.com/scala/scala3/pull/23545)
+- Backport "Check path of module prefix for tailrec" to 3.7.2 [#23544](https://github.com/scala/scala3/pull/23544)
+- Backport "Fix stale top level synthetic package object being used in later runs" to 3.7.2 [#23543](https://github.com/scala/scala3/pull/23543)
+- Backport "Improve completions when a lot of exports are present" to 3.7.2 [#23542](https://github.com/scala/scala3/pull/23542)
+- Backport "Fix regressions in asSeenFrom introduced in 3.7" [#23442](https://github.com/scala/scala3/pull/23442)
+
+
+# Contributors
+
+Thank you to all the contributors who made this release possible 🎉
+
+According to `git shortlog -sn --no-merges 3.7.2-RC1..3.7.2-RC2` these are:
+
+```
+    11  Wojciech Mazur
+     1  Guillaume Martres
+     1  Tomasz Godzik
+```