[Polkadot] [Wallet] add Westend Asset Hub to supported test networks (#36997)

We need to manually add Westend Asset Hub as a supported testnet to get it
properly display as a testnet network.

components/brave_wallet_ui/constants/types.ts

@@ -704,6 +704,7 @@ export const SupportedTestNetworks = [
   BraveWallet.Z_CASH_TESTNET,
   BraveWallet.CARDANO_TESTNET,
   BraveWallet.POLKADOT_TESTNET,
+  BraveWallet.POLKADOT_TESTNET_ASSET_HUB,
 ]
 
 export const SupportedTestNetworkEntityIds: EntityId[] = [
@@ -721,6 +722,7 @@ export const SupportedTestNetworkEntityIds: EntityId[] = [
   BraveWallet.Z_CASH_TESTNET,
   BraveWallet.CARDANO_TESTNET,
   BraveWallet.POLKADOT_TESTNET,
+  BraveWallet.POLKADOT_TESTNET_ASSET_HUB,
 ]
 
 export const DAppSupportedCoinTypes = [

components/brave_wallet_ui/utils/local-storage-utils.test.ts

@@ -68,6 +68,12 @@ const mockInitialFilteredOutNetworkKeys = [
       coin: BraveWallet.CoinType.DOT,
     })
     .toString(),
+  networkEntityAdapter
+    .selectId({
+      chainId: BraveWallet.POLKADOT_TESTNET_ASSET_HUB,
+      coin: BraveWallet.CoinType.DOT,
+    })
+    .toString(),
   networkEntityAdapter
     .selectId({
       chainId: BraveWallet.LOCALHOST_CHAIN_ID,