contracts-bedrock: simplify safecall test

Modularizes out a bit from https://github.com/ethereum-optimism/optimism/pull/7928
where the `SafeCall` test doesn't require `CommonTest` but instead can
just use `Test`. This simplifies the `setUp` and should reduce the
amount of computation required to set up the tests. This also reduces
the need to use `vm.assume` to ignore contracts that are deployed as
part of the `CommonTest` setup.

packages/contracts-bedrock/.gas-snapshot

@@ -672,7 +672,7 @@ ResourceMetering_Test:test_meter_updateTwoEmptyBlocks_succeeds() (gas: 23703)
 ResourceMetering_Test:test_meter_useMax_succeeds() (gas: 20020816)
 ResourceMetering_Test:test_meter_useMoreThanMax_reverts() (gas: 19549)
 SafeCall_Test:test_callWithMinGas_noLeakageHigh_succeeds() (gas: 1021670598)
-SafeCall_Test:test_callWithMinGas_noLeakageLow_succeeds() (gas: 1095190710)
+SafeCall_Test:test_callWithMinGas_noLeakageLow_succeeds() (gas: 1095190688)
 Semver_Test:test_behindProxy_succeeds() (gas: 507558)
 Semver_Test:test_version_succeeds() (gas: 9418)
 SequencerFeeVault_L2Withdrawal_Test:test_withdraw_toL2_succeeds() (gas: 78333)

packages/contracts-bedrock/test/SafeCall.t.sol

@@ -2,12 +2,12 @@
 pragma solidity 0.8.15;
 
 // Testing utilities
-import { CommonTest } from "test/CommonTest.t.sol";
+import { Test } from "forge-std/Test.sol";
 
 // Target contract
 import { SafeCall } from "src/libraries/SafeCall.sol";
 
-contract SafeCall_Test is CommonTest {
+contract SafeCall_Test is Test {
     /// @dev Tests that the `send` function succeeds.
     function testFuzz_send_succeeds(address from, address to, uint256 gas, uint64 value) external {
         vm.assume(from.balance == 0);
@@ -21,8 +21,7 @@ contract SafeCall_Test is CommonTest {
         vm.assume(to != address(0x000000000000000000636F6e736F6c652e6c6f67));
         // don't call the create2 deployer
         vm.assume(to != address(0x4e59b44847b379578588920cA78FbF26c0B4956C));
-        // don't call the ffi interface
-        vm.assume(to != address(0x5615dEB798BB3E4dFa0139dFa1b3D433Cc23b72f));
+        vm.assume(to != address(this));
 
         assertEq(from.balance, 0, "from balance is 0");
         vm.deal(from, value);
@@ -56,8 +55,7 @@ contract SafeCall_Test is CommonTest {
         vm.assume(to != address(0x000000000000000000636F6e736F6c652e6c6f67));
         // don't call the create2 deployer
         vm.assume(to != address(0x4e59b44847b379578588920cA78FbF26c0B4956C));
-        // don't call the ffi interface
-        vm.assume(to != address(0x5615dEB798BB3E4dFa0139dFa1b3D433Cc23b72f));
+        vm.assume(to != address(this));
 
         assertEq(from.balance, 0, "from balance is 0");
         vm.deal(from, value);
@@ -99,8 +97,7 @@ contract SafeCall_Test is CommonTest {
         vm.assume(to != address(0x000000000000000000636F6e736F6c652e6c6f67));
         // don't call the create2 deployer
         vm.assume(to != address(0x4e59b44847b379578588920cA78FbF26c0B4956C));
-        // don't call the FFIInterface
-        vm.assume(to != address(0x5615dEB798BB3E4dFa0139dFa1b3D433Cc23b72f));
+        vm.assume(to != address(this));
 
         assertEq(from.balance, 0, "from balance is 0");
         vm.deal(from, value);