fix(ci): resolve mypy failure and add wait_until default regression tests#70

OhYee merged 3 commits intofix/browser-navigate-wait-untilServerless-Devs/agentrun-sdk-python:fix/browser-navigate-wait-untilfrom

copilot/sub-pr-68-againServerless-Devs/agentrun-sdk-python:copilot/sub-pr-68-againCopy head branch name to clipboard