docs: Cherry pick release notes from v15 patches

Cherry pick release notes from v15 patches to main

Author: atscott

CHANGELOG.md

@@ -1,3 +1,16 @@
+# 15.0.3
+
+This release upgrades `@angular/language-service` to v15.0.3.
+
+* fix(server): filter unsupported code action to improve performance on save (#1834)
+* fix(compiler-cli): Produce diagnostic rather than crash when using invalid hostDirective ([#48314](https://github.com/angular/angular/pull/48314))
+
+# 15.0.2
+
+This release upgrades `@angular/language-service` to v15.0.2.
+
+* fix(extension): Ensure older projects that require View Engine can function (#1826)
+
 # 15.0.1
 
 This release fixes an incorrectly bundled `vsix` in the v15.0.0 release.