Chore: Make detect breaking changes workflow backport compatible (#45005) (#45052)

* fix(detect-breaking-changes): use the base.ref for backport compatibility

* chore(check-breaking-changes): update path to previous package dist directory

(cherry picked from commit f885c2ede9)

Co-authored-by: Jack Westbrook <jack.westbrook@gmail.com>

scripts/check-breaking-changes.sh

@@ -12,7 +12,7 @@ while IFS=" " read -r -a package; do
     PACKAGE_PATH=$(basename "$package")
 
     # Calculate current and previous package paths / names
-    PREV="./main/packages/$PACKAGE_PATH/dist/"
+    PREV="./base/packages/$PACKAGE_PATH/dist/"
     CURRENT="./pr/packages/$PACKAGE_PATH/dist/"
 
     # Temporarily skipping these packages as they don't have any exposed static typing