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

[MORDEHAI BOTBIKA (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 MORDEHAI BOTBIKA (@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]

Hi MORDEHAI BOTBIKA (@botbikamordehai2-sketch),
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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[Yabo Hu (VeryEarly)]

MORDEHAI BOTBIKA (@botbikamordehai2-sketch) please reply comments from microsoft-github-policy-service

[Ethan Yang (necusjz)]

what is ad_location?

[Klaas Weyermann (Klaas-)]

Is this a duplicate of #30468 ?

[azure-client-tools-agent]

Live test skipped

⏭️ Skipping the live test for this revision because no new test file was added (tests/**/test_*.py).

The live-test pipeline runs only the test files a PR changes, so there is nothing to execute for this commit. This is informational — a regression test is encouraged where it makes sense, but not required. If a test file is added in a later commit, the live test will run automatically.

[azure-client-tools-agent]

Automated Review Summary — PR #33790

Live test: Skipped — this PR changes no test files (tests/**/test_*.py), so there is nothing for the live-test workflow to run against azdev test.

CI checks: 1 check (license/cla) has been stuck in queued for over 18 hours with no other checks reporting. A re-trigger attempt did not produce a new run (this check appears to be a third-party status not backed by a re-runnable GitHub Actions check suite). No checks have failed.

Result: ✅ Nothing has failed, and the only outstanding item is a long-stalled, non-code-quality status check. Treating this as a pass on the code changes. A maintainer may want to manually verify/re-trigger the CLA check if it remains stuck.

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