fix: update fallback rpcs in ovault example (#1668)

Author: St0rmBr3w

.changeset/lovely-waves-invite.md

@@ -0,0 +1,5 @@
+---
+"@layerzerolabs/ovault-evm-example": patch
+---
+
+Update RPCs to testnet and add feature flag to README

examples/ovault-evm/README.md

@@ -55,7 +55,7 @@ OVault makes it extremely easy to move assets and shares between any supported c
 ## Scaffold this Example
 
 ```bash
-npx create-lz-oapp@latest --example ovault-evm
+LZ_ENABLE_OVAULT_EXAMPLE=1 npx create-lz-oapp@latest --example ovault-evm
 ```
 
 ## Helper Tasks

examples/ovault-evm/hardhat.config.ts

@@ -57,17 +57,17 @@ const config: HardhatUserConfig = {
     networks: {
         optimism: {
             eid: EndpointId.OPTSEP_V2_TESTNET,
-            url: process.env.RPC_URL_OPTIMISM_TESTNET || 'https://optimism.gateway.tenderly.co',
+            url: process.env.RPC_URL_OPTIMISM_TESTNET || 'https://optimism-sepolia.gateway.tenderly.co',
             accounts,
         },
         base: {
             eid: EndpointId.BASESEP_V2_TESTNET,
-            url: process.env.RPC_URL_BASE_TESTNET || 'https://base.gateway.tenderly.co',
+            url: process.env.RPC_URL_BASE_TESTNET || 'https://base-sepolia.gateway.tenderly.co',
             accounts,
         },
         arbitrum: {
             eid: EndpointId.ARBSEP_V2_TESTNET,
-            url: process.env.RPC_URL_ARBITRUM_TESTNET || 'https://arbitrum.gateway.tenderly.co',
+            url: process.env.RPC_URL_ARBITRUM_TESTNET || 'https://arbitrum-sepolia.gateway.tenderly.co',
             accounts,
         },
         hardhat: {