Change flag for Chrome/Edge headless mode in tests

[cgoldberg]

User description

💥 What does this PR do?

This PR changes the flag for setting headless mode in Chrome/Edge from --headless=new to --headless in places where it was used in internal tests.

Since Chrome 132, "new" headless mode is the default and --headless=new will eventually be removed.

• https://developer.chrome.com/blog/removing-headless-old-from-chrome

We should probably update the docs to mention this. Specifically:

• https://www.selenium.dev/documentation/webdriver/browsers/chrome/
• https://www.selenium.dev/blog/2023/headless-is-going-away/

🔄 Types of changes

• internal testing

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PR Type

Tests

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Description

• Update headless flag to --headless for Chrome/Edge tests

• Remove deprecated --headless=new usage in test code

• Ensure compatibility with Chrome 132+ headless mode changes

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Changes walkthrough 📝

Relevant files

Tests

EdgeDriverFunctionalTest.java Update Edge headless flag in functional test                          java/test/org/openqa/selenium/edge/EdgeDriverFunctionalTest.java Changed Edge headless mode argument from --headless=new to --headless in test. +1/-1      Browser.java Update headless flag for Chrome/Edge in driver options      java/test/org/openqa/selenium/testing/drivers/Browser.java Changed ChromeOptions and EdgeOptions headless argument from --headless=new to --headless. +2/-2      conftest.py Use `--headless` for Chrome/Edge in Python test config      py/conftest.py Updated headless argument for Chrome/Edge from --headless=new to --headless in test setup. +2/-2

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