{Core} Remove deprecated ADAL_PYTHON_SSL_NO_VERIFY environment variable (#33322)

[Ketan-33]

Related command
N/A – internal core cleanup, no az command affected.

Description
ADAL (Active Directory Authentication Library) was replaced by MSAL.
The ADAL_PYTHON_SSL_NO_VERIFY environment variable was previously used
to disable SSL verification in ADAL, but it no longer has any effect since
the migration. This PR removes the dead constant and the two os.environ
assignments referencing it in _debug.py.

No behavior change — AZURE_CLI_DISABLE_CONNECTION_VERIFICATION remains
the correct way to disable SSL verification.

Closes #33322

Testing Guide

1. Set AZURE_CLI_DISABLE_CONNECTION_VERIFICATION=1 and run any az command —
   SSL verification should still be disabled as expected.
2. Verify ADAL_PYTHON_SSL_NO_VERIFY is no longer set in the environment
   during a debug session.

History Notes
{Core} Remove deprecated ADAL_PYTHON_SSL_NO_VERIFY environment variable

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[yonzhan]

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[github-actions]

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[Copilot]

Pull request overview

Removes legacy ADAL-era environment-variable handling from azure-cli-core now that Azure CLI authentication has migrated to MSAL and the ADAL_PYTHON_SSL_NO_VERIFY variable no longer has any functional effect.

Changes:

• Removed the dead ADAL_PYTHON_SSL_NO_VERIFY constant from azure.cli.core._debug.
• Removed the two os.environ[...] assignments that attempted to set this deprecated variable when SSL verification is disabled.

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