ci: fix matrix exclude for solidity packages (#3255)

* ci: fix exclude keyword

* ci: try adding no-op benchmark tests

* Revert "ci: fix exclude keyword"

This reverts commit 4b869aa.

packages/contracts-core/test/GasBenchmark.t.sol

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import {Test} from "forge-std/Test.sol";
+
+/// @notice No gas benchmark is required for contracts-core
+contract GasBenchmarkTest is Test {
+    // solhint-disable-next-line no-empty-blocks
+    function testGasBenchmark() public {}
+}

packages/solidity-devops/test/GasBenchmark.t.sol

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import {Test} from "forge-std/Test.sol";
+
+/// @notice No gas benchmark is required for solidity-devops
+contract GasBenchmarkTest is Test {
+    // solhint-disable-next-line no-empty-blocks
+    function testGasBenchmark() public {}
+}