REMIX – Understanding Deployment Environments for Smart Contracts

The revert happened because you used an incompatible address to the interface IPoolAddressesProvider. In goerli testnet that address should be 0xc4dCB5126a3AfEd129BC3668Ea19285A9f56D15D as stated in the document. The fix :

    function getPrice() public view returns(uint256) {
        IPoolAddressesProvider provider = IPoolAddressesProvider(address(0xc4dCB5126a3AfEd129BC3668Ea19285A9f56D15D));
        address priceOracleAddress = provider.getPriceOracle();
        IPriceOracleGetter priceOracle = IPriceOracleGetter(priceOracleAddress);

        // address of link token Goerli
        address daiAddress = address(0x07C725d58437504CA5f814AE406e70E21C5e8e9e); 
        uint256 price = priceOracle.getAssetPrice(daiAddress);
        // emit print_value(price);
        return price;
    }

Note that I change the daiaddress to something else (LINK-TestnetMintableERC20-Aave in the document) to see the price different than 0. Output of getPrice() : uint256: 3000000000