refactor: removes unused useFastForwardBlockNumber (#4297)

* Remove unused code

* Remove useFastForwardBlockNumber hook.

* Remove fastForward function.

src/lib/hooks/transactions/updater.tsx

 import { TransactionReceipt } from '@ethersproject/abstract-provider'
 import { useWeb3React } from '@web3-react/core'
 import { SupportedChainId } from 'constants/chains'
-import useBlockNumber, { useFastForwardBlockNumber } from 'lib/hooks/useBlockNumber'
+import useBlockNumber from 'lib/hooks/useBlockNumber'
 import ms from 'ms.macro'
 import { useCallback, useEffect } from 'react'
 import { retry, RetryableError, RetryOptions } from 'utils/retry'
@@ -48,7 +48,6 @@ export default function Updater({ pendingTransactions, onCheck, onReceipt }: Upd
   const { chainId, provider } = useWeb3React()
 
   const lastBlockNumber = useBlockNumber()
-  const fastForwardBlockNumber = useFastForwardBlockNumber()
 
   const getReceipt = useCallback(
     (hash: string) => {
@@ -95,7 +94,7 @@ export default function Updater({ pendingTransactions, onCheck, onReceipt }: Upd
     return () => {
       cancels.forEach((cancel) => cancel())
     }
-  }, [chainId, provider, lastBlockNumber, getReceipt, fastForwardBlockNumber, onReceipt, onCheck, pendingTransactions])
+  }, [chainId, provider, lastBlockNumber, getReceipt, onReceipt, onCheck, pendingTransactions])
 
   return null
 }

src/lib/hooks/useBlockNumber.tsx

@@ -6,7 +6,6 @@ const MISSING_PROVIDER = Symbol()
 const BlockNumberContext = createContext<
   | {
       value?: number
-      fastForward(block: number): void
     }
   | typeof MISSING_PROVIDER
 >(MISSING_PROVIDER)
@@ -24,10 +23,6 @@ export default function useBlockNumber(): number | undefined {
   return useBlockNumberContext().value
 }
 
-export function useFastForwardBlockNumber(): (block: number) => void {
-  return useBlockNumberContext().fastForward
-}
-
 export function BlockNumberProvider({ children }: { children: ReactNode }) {
   const { chainId: activeChainId, provider } = useWeb3React()
   const [{ chainId, block }, setChainBlock] = useState<{ chainId?: number; block?: number }>({ chainId: activeChainId })
@@ -77,7 +72,6 @@ export function BlockNumberProvider({ children }: { children: ReactNode }) {
   const value = useMemo(
     () => ({
       value: chainId === activeChainId ? block : undefined,
-      fastForward: (block: number) => setChainBlock({ chainId: activeChainId, block }),
     }),
     [activeChainId, block, chainId]
   )