fix(types,utils,promotion): Move from total to original_total to resolve edge case for adjustments calculation (#13106)

* Move from total to original_total to resolve edge case in adjustment calculation

* Added changeset

* Added test case for correction

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Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

.changeset/sour-horses-beam.md

@@ -0,0 +1,7 @@
+---
+"@medusajs/promotion": patch
+"@medusajs/types": patch
+"@medusajs/utils": patch
+---
+
+Moved calculation logic from total to original_total to ensure consistent base values