feat: Override access control functions to have a consistent state in the bridge contract

[zguesmi]

In the bridge contract IexecLayerZeroBridge both Ownable (used by LayerZero) and AccessControlDefaultAdmin are used to manager roles, where the owner and the defaultAdmin are supposed to always be the same account, which is the case at deployment time. However, changing one of them later does not change the other. For example, one could change (for any reason) the owner to a new wallet without changing the defaultAdmin which could lead to losing control of the contract if the old private key is destroyed. The suggested fix is to override the following Ownable functions:

• owner: should return the defaultAdmin address.
• onlyOwner: nothing to do
• renounceOwnership and transferOwnership: should always revert

[Copilot]

Pull Request Overview

This PR overrides access control functions in the IexecLayerZeroBridge contract to ensure consistent state management between OwnableUpgradeable and AccessControlDefaultAdminRulesUpgradeable inheritance. The primary purpose is to prevent ownership operations through the Ownable interface and redirect users to use AccessControlDefaultAdminRules instead.

• Disables renounceOwnership and transferOwnership functions to prevent direct ownership changes
• Updates owner() function to return the default admin instead of the ownable owner
• Ensures state consistency by updating the ownable owner when default admin transfers occur

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/interfaces/IIexecLayerZeroBridge.sol	Adds OperationNotAllowed error for blocked ownership operations
src/bridges/layerZero/IexecLayerZeroBridge.sol	Implements access control overrides and state synchronization logic
test/units/bridges/layerZero/IexecLayerZeroBridge.t.sol	Adds comprehensive tests for the new access control behavior

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.78%. Comparing base (8c72922) to head (574eb9b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bridges/layerZero/IexecLayerZeroBridge.sol	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   83.65%   83.78%   +0.12%     
==========================================
  Files           4        4              
  Lines         104      111       +7     
  Branches        7        7              
==========================================
+ Hits           87       93       +6     
- Misses         16       17       +1     
  Partials        1        1              

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[Le-Caignec]

LGTM