SNOW-3168502: Add auto-closing for web browser authentication windows

[wenzel-k24]

What is the current behavior?

When using authenticator='externalbrowser' with snowflake-connector-python, the connector opens a browser window for SSO authentication. After successful login, a success page is displayed, but the browser window remains open and must be closed manually by the user.

What is the desired behavior?

After successful authentication, the browser window should automatically attempt to close itself.

How would this improve snowflake-connector-python?

How would this improve snowflake-connector-python?
• Improves user experience in CLI and developer workflows
• Reduces friction during repeated authentication
• Prevents accumulation of unnecessary browser windows

References and other background

No response

[sfc-gh-sghosh]

Hello @wenzel-k24

Thanks for raising the issue and providing the #2775 as a fix.
At present the message is "Your identity was confirmed and propagated to Snowflake jupyter_notebook. You can close this window now and go back where you started from", so have to close it manually at present.

We will review the #2775 and approve accordingly.