chore: prevent workflow steps to call modules when not necessary (#11632)

**What**
Some steps were calling the modules even when nothing was needed which for some operations would create transaction for nothing leading to extra execution time that add up very quickly on cloud network

Co-authored-by: Carlos R. L. Rodrigues <37986729+carlos-r-l-rodrigues@users.noreply.github.com>

packages/modules/cart/src/services/cart-module.ts

@@ -1083,10 +1083,9 @@ export default class CartModuleService
       )
     }
 
-    const result = await this.lineItemTaxLineService_.upsert(
-      taxLines,
-      sharedContext
-    )
+    const result = taxLines.length
+      ? await this.lineItemTaxLineService_.upsert(taxLines, sharedContext)
+      : []
 
     return await this.baseRepository_.serialize<CartTypes.LineItemTaxLineDTO[]>(
       result,
@@ -1201,10 +1200,12 @@ export default class CartModuleService
       )
     }
 
-    const result = await this.shippingMethodTaxLineService_.upsert(
-      taxLines as UpdateShippingMethodTaxLineDTO[],
-      sharedContext
-    )
+    const result = taxLines.length
+      ? await this.shippingMethodTaxLineService_.upsert(
+          taxLines as UpdateShippingMethodTaxLineDTO[],
+          sharedContext
+        )
+      : []
 
     return await this.baseRepository_.serialize<
       CartTypes.ShippingMethodTaxLineDTO[]