fix: Fix copy of "Network fee" on approval (#12370)

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## **Description**

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also include relevant motivation and context. Have in mind the following
questions:
1. What is the reason for the change?
2. What is the improvement/solution?
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This PR make send confirmation to use "Network fee" instead of
"Estimated gas fee"

## **Related issues**

Fixes: MetaMask/MetaMask-planning#3611

## **Manual testing steps**

N/A

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

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### **After**

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## **Pre-merge author checklist**

- [ ] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [ ] I’ve included tests if applicable
- [ ] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [ ] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

app/components/Views/confirmations/SendFlow/Confirm/__snapshots__/index.test.tsx.snap

@@ -1319,7 +1319,7 @@ exports[`Confirm should render correctly 1`] = `
                                       ]
                                     }
                                   >
-                                    Estimated gas fee
+                                    Network fee
                                     <TouchableOpacity
                                       hitSlop={
                                         {

app/components/Views/confirmations/components/TransactionReview/TransactionReviewEIP1559Update/__snapshots__/index.test.tsx.snap

@@ -96,7 +96,7 @@ exports[`TransactionReviewEIP1559 should render correctly 1`] = `
             ]
           }
         >
-          Estimated gas fee
+          Network fee
           <TouchableOpacity
             hitSlop={
               {

app/components/Views/confirmations/components/TransactionReview/TransactionReviewEIP1559Update/index.tsx

@@ -31,7 +31,6 @@ const TransactionReviewEIP1559Update = ({
   onEdit,
   hideTotal,
   noMargin,
-  origin,
   originWarning,
   onUpdatingValuesStart,
   onUpdatingValuesEnd,
@@ -129,9 +128,7 @@ const TransactionReviewEIP1559Update = ({
               orange={Boolean(originWarning)}
               noMargin
             >
-              {!origin
-                ? strings('transaction_review_eip1559.estimated_gas_fee')
-                : strings('transaction_review_eip1559.network_fee')}
+              {strings('transaction_review_eip1559.network_fee')}
               <TouchableOpacity
                 style={styles.gasInfoContainer}
                 onPress={() =>