feat: support sepolia testnet

Context

https://new.admin.opencerts.io/ shows unknown network when metamask wallet is set to Sepolia because it is not supported (https://github.com/ethers-io/ethers.js/issues/3325)
Pipeline and tests are not updated for a long time, some are not working with this update

Use node 18
Bumped ethers version so that Sepolia testnet can be supported
Specify port 4173 (pipeline's port for running webpage) instead of 5000 for integration:wait
Finetune error handling with eth-rpc-errors as recommended by metamask
FYI, used EthereumProviderError instead of EthereumRpcError because we are previously checking for code 4001 which is in EIP-1193 (for context of code 4001 returned by metamask, visit https://eips.ethereum.org/EIPS/eip-1193#provider-errors)
Added 10mins timeout for Github CI to prevent actions running indefinitely
Puppeteer page.waitFor changed to use custom timeout sleep (can't use waitForTimeout because its obsolete)
Added reloading of page after Dappeteer.launch to prevent hanging
Followed Dappeteer test case to add Localhost 8545 testnet
Added npm run dev
Resolve catch error handling errors (specific error if Error instance, else generic message is shown)

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