Check IGP ownership, transfer IGP ownership in the initializer (#1895)

### Description

* Adds the IGP & DefaultIsmIgp to the HyperlaneCoreChecker's list of
ownables
* Transfers ownership in the `initialize` function of the IGP - this way
we won't ever get in a scenario where the proxy admin is the owner for
fresh deploys

### Drive-by changes

* The provided default mumbai rpc `https://rpc-mumbai.maticvigil.com`
was giving problems for eth_getStorageAt, so changed it
* Removed the DefaultIsmInterchainGasPaymaster from the list of proxies
because it's not proxied (this is in #1765, but made this change in here
too)

### Related issues

n/a

### Backward compatibility

_Are these changes backward compatible?_

Yes

_Are there any infrastructure implications, e.g. changes that would
prohibit deploying older commits using this infra tooling?_

None


### Testing

_What kind of testing have these changes undergone?_

Unit Tests

solidity/contracts/igps/InterchainGasPaymaster.sol

@@ -53,13 +53,21 @@ contract InterchainGasPaymaster is
     // ============ Constructor ============
 
     constructor(address _beneficiary) {
-        initialize(_beneficiary); // allows contract to be used without proxying
+        initialize(msg.sender, _beneficiary); // allows contract to be used without proxying
     }
 
     // ============ External Functions ============
 
-    function initialize(address _beneficiary) public initializer {
+    /**
+     * @param _owner The owner of the contract.
+     * @param _beneficiary The beneficiary.
+     */
+    function initialize(address _owner, address _beneficiary)
+        public
+        initializer
+    {
         __Ownable_init();
+        _transferOwnership(_owner);
         _setBeneficiary(_beneficiary);
     }
 

solidity/test/igps/InterchainGasPaymaster.t.sol

@@ -44,7 +44,7 @@ contract InterchainGasPaymasterTest is Test {
 
     function testInitializeRevertsIfCalledTwice() public {
         vm.expectRevert("Initializable: contract is already initialized");
-        igp.initialize(beneficiary);
+        igp.initialize(address(this), beneficiary);
     }
 
     // ============ payForGas ============

typescript/sdk/src/consts/chainMetadata.ts

@@ -472,7 +472,7 @@ export const mumbai: ChainMetadata = {
   nativeToken: maticToken,
   publicRpcUrls: [
     {
-      http: 'https://rpc-mumbai.maticvigil.com',
+      http: 'https://rpc.ankr.com/polygon_mumbai',
       pagination: {
         // eth_getLogs and eth_newFilter are limited to a 10,000 blocks range
         blocks: 10000,

typescript/sdk/src/deploy/core/HyperlaneCoreChecker.ts

@@ -62,6 +62,8 @@ export class HyperlaneCoreChecker extends HyperlaneAppChecker<
         contracts.proxyAdmin,
         contracts.mailbox.contract,
         contracts.multisigIsm,
+        contracts.interchainGasPaymaster.contract,
+        contracts.defaultIsmInterchainGasPaymaster,
       ];
       return this.checkOwnership(chain, config.owner, ownables);
     }

typescript/sdk/src/deploy/core/HyperlaneCoreDeployer.ts

@@ -69,13 +69,14 @@ export class HyperlaneCoreDeployer extends HyperlaneDeployer<
   ): Promise<
     ProxiedContract<InterchainGasPaymaster, TransparentProxyAddresses>
   > {
+    const owner = this.configMap[chain].owner;
     const beneficiary = this.configMap[chain].igp.beneficiary;
     const igp = await this.deployProxiedContract(
       chain,
       'interchainGasPaymaster',
       [beneficiary],
       proxyAdmin,
-      [beneficiary],
+      [owner, beneficiary],
       deployOpts,
     );