[py] Deprecate support for FTP proxies

[cgoldberg]

User description

🔗 Related Issues

#15905

💥 What does this PR do?

This PR adds a deprecation warning when trying to set an ftpProxy.

💡 Additional Considerations

Newer browsers already don't support FTP proxies, but we will deprecate it in case users are pinned to older browsers that still support it.

🔄 Types of changes

• Deprecation

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PR Type

Other

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Description

• Deprecate FTP proxy support with warning message
• Add TODO comments for future removal
• Update tests with deprecation comments
• Minor formatting improvements to docstrings

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Changes walkthrough 📝

	Relevant files
Enhancement	proxy.py Add FTP proxy deprecation warning                                                py/selenium/webdriver/common/proxy.py • Add deprecation warning when setting ftpProxy • Import warnings module for deprecation handling • Add TODO comments for future removal • Minor docstring formatting improvements +17/-3
Tests	proxy_tests.py Update tests with deprecation comments                                      py/test/selenium/webdriver/common/proxy_tests.py • Add TODO comments referencing FTP proxy deprecation • Update test comments to indicate deprecated status • Reference GitHub issue for future removal +8/-0

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