InstallAppleCertificateV2 task is failing on post-job step

[sergey-koryshev]

Task name: InstallAppleCertificateV2

Description: sometimes task InstallAppleCertificateV2 is failing on post-job step with unhandled exception but it should only write warning in any cases. It happened due to missed await keyword which lead to the fact that promise was not handled and exception was not caught by try/catch statement

Documentation changes required: (Y/N) N

Added unit tests: (Y/N) N

Attached related issue: (Y/N) N

Checklist:

• Task version was bumped - please check instruction how to do it
• Checked that applied changes work as expected