use css selector instead of xpath

[LawyZheng]

:rocket:	This description was created by Ellipsis for commit fe76bd7ac440dc1fd0f27b4a58f8e92dd1a10865

Summary:

Replaced XPath selectors with CSS selectors across the codebase for consistency and improved handling.

Key points:

• Replaced xpath with css selectors in skyvern/exceptions.py for MissingElement and MultipleElementsFound exceptions.
• Updated skyvern/forge/agent.py to use id_to_css_dict instead of id_to_xpath_dict for artifact creation.
• Modified skyvern/forge/sdk/artifact/models.py to deprecate VISIBLE_ELEMENTS_ID_XPATH_MAP and introduce VISIBLE_ELEMENTS_ID_CSS_MAP.
• Adjusted skyvern/forge/sdk/artifact/storage/base.py to map VISIBLE_ELEMENTS_ID_CSS_MAP to json.
• Refactored skyvern/webeye/actions/handler.py to use CSS selectors in various action handlers (handle_click_action, handle_input_text_action, etc.).
• Updated skyvern/webeye/scraper/scraper.py to build id_to_css_dict instead of id_to_xpath_dict.
• Changed resolve_locator function in skyvern/webeye/utils/dom.py to use CSS selectors.

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