Add nightly build option to run only provisioning

Summary

Enable running only the provisioning step for Qt5 integrations to maintain provisioning health checks.

Description

The provisioning step will be removed from nightly Qt5 health checks because it introduces unnecessary noise into already flaky test results.

However, it's still important to test provisioning regularly to catch infrastructure issues early. To support this, it would be ideal to have an option to run only the provisioning step for a Qt5 integration, without executing the full test suite.

This would allow:

• Isolated monitoring of provisioning reliability
• Faster feedback on provisioning-related regressions
• Reduced noise in nightly test results

Proposed solution

Introduce a mode or flag in the integration system that triggers only the provisioning phase for a given Qt5 integration.