feat(permit): remove permit related feature flags (#3320)

* feat(permit): remove permit related feature flags

* refactor: remove unecessary variable

apps/cowswap-frontend/src/common/hooks/featureFlags/useIsPermitEnabled.ts

@@ -1,25 +1,6 @@
-import { SupportedChainId } from '@cowprotocol/cow-sdk'
 import { useIsSmartContractWallet } from '@cowprotocol/wallet'
 
-import { useFeatureFlags } from './useFeatureFlags'
-
-export function useIsPermitEnabled(chainId: SupportedChainId | undefined): boolean {
-  const isSmartContractWallet = useIsSmartContractWallet()
-  const { permitEnabledMainnet, permitEnabledGoerli, permitEnabledGnosis } = useFeatureFlags()
-
+export function useIsPermitEnabled(): boolean {
   // Permit is only available for EOAs
-  if (isSmartContractWallet) {
-    return false
-  }
-
-  switch (chainId) {
-    case SupportedChainId.MAINNET:
-      return !!permitEnabledMainnet
-    case SupportedChainId.GNOSIS_CHAIN:
-      return !!permitEnabledGnosis
-    case SupportedChainId.GOERLI:
-      return !!permitEnabledGoerli
-    default:
-      return false
-  }
+  return !useIsSmartContractWallet()
 }

apps/cowswap-frontend/src/modules/permit/hooks/useIsTokenPermittable.ts

@@ -43,7 +43,7 @@ export function useIsTokenPermittable(
   // Avoid building permit info in the first place if order type is not supported
   const isPermitSupported = !!tradeType && ORDER_TYPE_SUPPORTS_PERMIT[tradeType]
 
-  const isPermitEnabled = useIsPermitEnabled(chainId) && isPermitSupported
+  const isPermitEnabled = useIsPermitEnabled() && isPermitSupported
 
   const addPermitInfo = useAddPermitInfo()
   const permitInfo = usePermitInfo(chainId, isPermitEnabled ? lowerCaseAddress : undefined)