feat: Add gasLimitNoBuffer to transactionMeta (#5113)

## Explanation

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This PR aims to add `gasLimitNoBuffer` to `transactionMeta` to show
minimum value while calculating network fee.

## References

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* Fixes #12345
* Related to #67890
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* Fixes MetaMask/MetaMask-planning#3773

## Changelog

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### `@metamask/transaction-controller`

- **Added**: Add `gasLimitNoBuffer` to `transactionMeta`
- `gasLimitNoBuffer` is the estimated gas (via `eth_estimateGas`) for
the transaction without buffer.

## Checklist

- [X] I've updated the test suite for new or updated code as appropriate
- [X] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [X] I've highlighted breaking changes using the "BREAKING" category
above as appropriate
- [X] I've prepared draft pull requests for clients and consumer
packages to resolve any breaking changes

packages/transaction-controller/CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add `gasLimitNoBuffer` property to `TransactionMeta` type ([#5113](https://github.com/MetaMask/core/pull/5113))
+  - `gasLimitNoBuffer` is the estimated gas for the transaction without any buffer applied.
+
 ## [42.1.0]
 
 ### Added

packages/transaction-controller/src/types.ts

@@ -184,6 +184,11 @@ type TransactionMetaBase = {
   /** Whether the gas fee estimates have been checked at least once. */
   gasFeeEstimatesLoaded?: boolean;
 
+  /**
+   * The estimated gas for the transaction without any buffer applied.
+   */
+  gasLimitNoBuffer?: string;
+
   /**
    * A hex string of the transaction hash, used to identify the transaction on the network.
    */

packages/transaction-controller/src/utils/gas.test.ts

@@ -197,6 +197,9 @@ describe('gas', () => {
         expect(updateGasRequest.txMeta.originalGasEstimate).toBe(
           updateGasRequest.txMeta.txParams.gas,
         );
+        expect(updateGasRequest.txMeta.gasLimitNoBuffer).toBe(
+          toHex(estimatedGas),
+        );
       });
 
       it('to padded estimate using chain multiplier if padded estimate less than percentage of block gas limit', async () => {
@@ -219,6 +222,9 @@ describe('gas', () => {
         expect(updateGasRequest.txMeta.originalGasEstimate).toBe(
           updateGasRequest.txMeta.txParams.gas,
         );
+        expect(updateGasRequest.txMeta.gasLimitNoBuffer).toBe(
+          toHex(estimatedGas),
+        );
       });
 
       it('to percentage of block gas limit if padded estimate only is greater than percentage of block gas limit', async () => {
@@ -241,6 +247,9 @@ describe('gas', () => {
         expect(updateGasRequest.txMeta.originalGasEstimate).toBe(
           updateGasRequest.txMeta.txParams.gas,
         );
+        expect(updateGasRequest.txMeta.gasLimitNoBuffer).toBe(
+          toHex(estimatedGas),
+        );
       });
 
       describe('to fixed value', () => {

packages/transaction-controller/src/utils/gas.ts

@@ -32,10 +32,11 @@ export async function updateGas(request: UpdateGasRequest) {
   const { txMeta } = request;
   const initialParams = { ...txMeta.txParams };
 
-  const [gas, simulationFails] = await getGas(request);
+  const [gas, simulationFails, gasLimitNoBuffer] = await getGas(request);
 
   txMeta.txParams.gas = gas;
   txMeta.simulationFails = simulationFails;
+  txMeta.gasLimitNoBuffer = gasLimitNoBuffer;
 
   if (!initialParams.gas) {
     txMeta.originalGasEstimate = txMeta.txParams.gas;
@@ -132,17 +133,17 @@ export function addGasBuffer(
 
 async function getGas(
   request: UpdateGasRequest,
-): Promise<[string, TransactionMeta['simulationFails']?]> {
+): Promise<[string, TransactionMeta['simulationFails']?, string?]> {
   const { isCustomNetwork, chainId, txMeta } = request;
 
   if (txMeta.txParams.gas) {
     log('Using value from request', txMeta.txParams.gas);
-    return [txMeta.txParams.gas];
+    return [txMeta.txParams.gas, undefined, txMeta.txParams.gas];
   }
 
   if (await requiresFixedGas(request)) {
     log('Using fixed value', FIXED_GAS);
-    return [FIXED_GAS];
+    return [FIXED_GAS, undefined, FIXED_GAS];
   }
 
   const { blockGasLimit, estimatedGas, simulationFails } = await estimateGas(
@@ -156,7 +157,7 @@ async function getGas(
         ? 'Using original estimate as custom network'
         : 'Using original fallback estimate as simulation failed',
     );
-    return [estimatedGas, simulationFails];
+    return [estimatedGas, simulationFails, estimatedGas];
   }
 
   const bufferMultiplier =
@@ -170,7 +171,7 @@ async function getGas(
     bufferMultiplier,
   );
 
-  return [bufferedGas, simulationFails];
+  return [bufferedGas, simulationFails, estimatedGas];
 }
 
 async function requiresFixedGas({