fix(rpc): get_proof test fail because block numbers are not high enough (#1239)

* Problem: get_proof test fail because block numbers are not high enough

Solution:
- wait for app block height rather than tendermint block height

* Update tests/integration_tests/test_types.py

* keep get_proof response the same as geth

Co-authored-by: Daniel Burckhardt <daniel.m.burckhardt@gmail.com>

rpc/backend/account_info.go

@@ -44,9 +44,8 @@ func (b *Backend) GetProof(address common.Address, storageKeys []string, blockNr
 	height := blockNum.Int64()
 	_, err = b.GetTendermintBlockByNumber(blockNum)
 	if err != nil {
-		// Get 'latest' proof if query is in the future
-		// this imitates geth behavior
-		height = 0
+		// the error message imitates geth behavior
+		return nil, errors.New("header not found")
 	}
 	ctx := rpctypes.ContextWithHeight(height)