Add and test a batch method for BEOEPC updateDelegateeScore method

[apbendi]

We want a batch version of this method

It should take an array of structs with both parameters, iterate over them, perform the appropriate checks, and then do the update. To do this, the internal method should probably be refactored so that both the single update and batch update methods share the same internal method for checks and execution. The functionality and signature of the existing method should not change.

[funkyenough]

During implementation, I identified an important architectural constraint that affects the suggested refactoring approach:

Key Issue: The existing _updateDelegateeScore internal method cannot accommodate the authorization and validation checks from the public methods, as it's shared by overrideDelegateeScore, which intentionally bypasses these checks.

  function overrideDelegateeScore(address _delegatee, uint256 _newScore) public {
    _checkOwner();
    _updateDelegateeScore(_delegatee, _newScore);  // No oracle/pause/lock checks
    _setDelegateeScoreLock(_delegatee, true);
  }

Moving these validations into the internal method would break this intended behavior.
As a result, the checks are duplicated in the public method.