fix(create-medusa-app): ensure the same package manager is used consistently (#12714)

* fix(create-medusa-app): ensure the same package manager is used consistently

* fix verbose not working as expected

* improvements

* remove legacy peer deps

* format

.changeset/shy-nails-enjoy.md

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+---
+"create-medusa-app": patch
+---
+
+fix(create-medusa-app): ensure the same package manager is used consistently