dynamic choice of browser context

[LawyZheng]

Although chromium-headless and chromium-heaful are registered into BrowserContextFactory, we can only choose one for all tasks(workflows) because we create the type by reading the config in env. https://github.com/Skyvern-AI/skyvern/blob/d2735100ddd38b9272e7f02ab2635493ccf9f425/skyvern/webeye/browser_factory.py#L86

Is it necessary to offer a dynamic option? maybe at the task(workflow) level? Like task(workflow) A could choose headless and task(workflow) B could choose headful? Sure, the BROWSER_TYPE in the env config could be the default choice if not browser type is specified by the task(workflow).