fix: use system SSL context in install.py to avoid self-signed certificate errors (closes #28044)

[botbikamordehai2-sketch]

What

When running az bicep install on corporate machines with self-signed root certificates, SSL verification can fail because urlopen does not use the system's certificate store by default. This leads to the error:

SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self-signed certificate in certificate chain (_ssl.c:1006)'))

Fix

Modified create_virtualenv to use ssl.create_default_context() when making HTTPS requests, which respects the system's certificate store (including corporate certificates installed in the Windows cert store). This change is minimal and preserves backward compatibility.

Closes #28044

[azure-client-tools-bot-prd]

Hi @botbikamordehai2-sketch,
Since the current milestone time is less than 7 days, this pr will be reviewed in the next milestone.

[azure-client-tools-bot-prd]

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Usually we only allow pull requests to be submitted to the dev branch, please double check your pull request target branch main.

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[VeryEarly]

@botbikamordehai2-sketch please reply comments from microsoft-github-policy-service

[necusjz]

what is ad_location?

[Klaas-]

Is this a duplicate of #30468 ?