Fix .gitignore: stop tracking ignored files

backend/lib/openzeppelin-contracts/contracts/mocks/governance/GovernorTimelockControlMock.sol

@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+import "../../governance/extensions/GovernorTimelockControl.sol";
+import "../../governance/extensions/GovernorSettings.sol";
+import "../../governance/extensions/GovernorCountingSimple.sol";
+import "../../governance/extensions/GovernorVotesQuorumFraction.sol";
+
+abstract contract GovernorTimelockControlMock is
+    GovernorSettings,
+    GovernorTimelockControl,
+    GovernorVotesQuorumFraction,
+    GovernorCountingSimple
+{
+    function supportsInterface(
+        bytes4 interfaceId
+    ) public view override(Governor, GovernorTimelockControl) returns (bool) {
+        return super.supportsInterface(interfaceId);
+    }
+
+    function quorum(
+        uint256 blockNumber
+    ) public view override(IGovernor, GovernorVotesQuorumFraction) returns (uint256) {
+        return super.quorum(blockNumber);
+    }
+
+    function state(uint256 proposalId) public view override(Governor, GovernorTimelockControl) returns (ProposalState) {
+        return super.state(proposalId);
+    }
+
+    function proposalThreshold() public view override(Governor, GovernorSettings) returns (uint256) {
+        return super.proposalThreshold();
+    }
+
+    function _execute(
+        uint256 proposalId,
+        address[] memory targets,
+        uint256[] memory values,
+        bytes[] memory calldatas,
+        bytes32 descriptionHash
+    ) internal override(Governor, GovernorTimelockControl) {
+        super._execute(proposalId, targets, values, calldatas, descriptionHash);
+    }
+
+    function _cancel(
+        address[] memory targets,
+        uint256[] memory values,
+        bytes[] memory calldatas,
+        bytes32 descriptionHash
+    ) internal override(Governor, GovernorTimelockControl) returns (uint256 proposalId) {
+        return super._cancel(targets, values, calldatas, descriptionHash);
+    }
+
+    function _executor() internal view override(Governor, GovernorTimelockControl) returns (address) {
+        return super._executor();
+    }
+
+    function nonGovernanceFunction() external {}
+}