add overrides (#302)

Co-authored-by: steven <[email protected]>

Author: gpsanant

src/ServiceManagerBase.sol

@@ -146,7 +146,7 @@ abstract contract ServiceManagerBase is ServiceManagerBaseStorage {
      * @dev No guarantee is made on uniqueness of each element in the returned array.
      *      The off-chain service should do that validation separately
      */
-    function getRestakeableStrategies() external view returns (address[] memory) {
+    function getRestakeableStrategies() external virtual view returns (address[] memory) {
         uint256 quorumCount = _registryCoordinator.quorumCount();
 
         if (quorumCount == 0) {
@@ -180,6 +180,7 @@ abstract contract ServiceManagerBase is ServiceManagerBaseStorage {
      */
     function getOperatorRestakedStrategies(address operator)
         external
+        virtual
         view
         returns (address[] memory)
     {