[py] Call service.stop() when session can't be started

[cgoldberg]

User description

🔗 Related Issues

This is a fix for #15634 (for Python only)

💥 What does this PR do?

When a driver fails to start the browser, SessionNotCreatedException is raised. This PR fixes it so the underlying driver service is explicitly stopped when any exception occurs.

I added tests for this for Chrome, Edge, and Firefox

🔄 Types of changes

• Bug fix (backwards compatible)

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PR Type

Bug fix

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Description

• Ensures service.stop() is called when session creation fails.

• Adds exception handling for Exception in start_session.

• Adds tests for this

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Changes walkthrough 📝

	Relevant files
Bug fix	webdriver.py Add exception handling for session creation failure            py/selenium/webdriver/remote/webdriver.py Added handling for SessionNotCreatedException in start_session. Ensured service.stop() is called when session creation fails. Improved error handling during session initialization. +8/-3

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