chore: mv UpgradeTest to integration/tests/upgrade/

Author: 0xClandestine

src/test/integration/tests/upgrade/Complete_PreSlashing_Withdrawal.t.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: BUSL-1.1
 pragma solidity ^0.8.27;
 
-import "src/test/integration/UpgradeTest.t.sol";
+import "src/test/integration/tests/upgrade/UpgradeTest.t.sol";
 
 contract Integration_Upgrade_Complete_PreSlashing_Withdrawal_Base is UpgradeTest {
     struct TestState {

src/test/integration/tests/upgrade/Delegate_Upgrade_Allocate.t.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: BUSL-1.1
 pragma solidity ^0.8.27;
 
-import "src/test/integration/UpgradeTest.t.sol";
+import "src/test/integration/tests/upgrade/UpgradeTest.t.sol";
 
 contract Integration_Upgrade_Deposit_Delegate_Allocate is UpgradeTest {
     struct TestState {

src/test/integration/tests/upgrade/EigenPod.t.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: BUSL-1.1
 pragma solidity ^0.8.27;
 
-import "src/test/integration/UpgradeTest.t.sol";
+import "src/test/integration/tests/upgrade/UpgradeTest.t.sol";
 
 contract Integration_Upgrade_EigenPod_Base is UpgradeTest {
     uint[] shares;

src/test/integration/tests/upgrade/EigenPod_Slashing_Migration.t.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: BUSL-1.1
 pragma solidity ^0.8.27;
 
-import "src/test/integration/UpgradeTest.t.sol";
+import "src/test/integration/tests/upgrade/UpgradeTest.t.sol";
 
 contract Integration_Upgrade_EigenPod_Slashing_Migration is UpgradeTest, EigenPodPausingConstants {
     uint[] shares;