Add env var setting to disable ssl verification for user journey tests

[soapy1]

Description

This PR adds an option when running user journey tests to disable SSL verification. This is useful when running tests against a host that has ssl enabled but is does not have valid certs (eg. using self signed certs).

In order to disable SSL verification in the user journey tests, set the env var CONDA_STORE_TEST_VERIFY_SSL=0. By default, SSL verification will be enabled.

Pull request checklist

• Did you test this change locally?
• Did you update the documentation (if required)?
• Did you add/update relevant tests for this change (if required)?

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[soapy1]

The failing test is unrelated to these changes and is resolved in #1041

[peytondmurray]

Related: nebari-dev/nebari#2895

Nebari runs tests against their conda-store deployment. In their test environment, conda-store is accessed over https, but does not have valid certs.

[peytondmurray]

This looks like it'll be useful for the nebari team :)