fix: gasFeeEstimates property undefined (#29312)

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## **Description**
This PR fixes an issue created by Sentry where the property
`gasFeeEstimates` is `undefined`.
Added an early return when the property is `undefined` and covered the
scenario with unit tests.
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2. What is the improvement/solution?
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## **Related issues**

Fixes: #27501
#27241

## **Manual testing steps**

1. Go to this test dapp
2. Block requests against gas-api
3. Start a send or contract interaction 
4. Verify the console

## **Screenshots/Recordings**


[block-gas-api.webm](https://github.com/user-attachments/assets/1c3cf638-905e-4df9-b875-84f0056979b1)


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### **Before**

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### **After**

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- [x] I've completed the PR template to the best of my ability
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## **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.

ui/pages/confirmations/hooks/useTransactionFunction.test.js

@@ -164,4 +164,16 @@ describe('useMaxPriorityFeePerGasInput', () => {
       userFeeLevel: 'dappSuggested',
     });
   });
+
+  it('returns early when gasFeeEstimates is undefined', () => {
+    const mockUpdateTransaction = jest
+      .spyOn(Actions, 'updateTransactionGasFees')
+      .mockImplementation(() => ({ type: '' }));
+
+    const { result } = renderUseTransactionFunctions({
+      gasFeeEstimates: undefined,
+    });
+    result.current.updateTransactionUsingEstimate(GasRecommendations.low);
+    expect(mockUpdateTransaction).not.toHaveBeenCalled();
+  });
 });

ui/pages/confirmations/hooks/useTransactionFunctions.js

@@ -201,9 +201,10 @@ export const useTransactionFunctions = ({
 
   const updateTransactionUsingEstimate = useCallback(
     (gasFeeEstimateToUse) => {
-      if (!gasFeeEstimates[gasFeeEstimateToUse]) {
+      if (!gasFeeEstimates?.[gasFeeEstimateToUse]) {
         return;
       }
+
       const { suggestedMaxFeePerGas, suggestedMaxPriorityFeePerGas } =
         gasFeeEstimates[gasFeeEstimateToUse];
       updateTransaction({