chore(#1791): added a check if kubelet started

[AlexNabokikh]

Issue #1791

Description of changes:

• After the command to start the kubelet, a conditional check is added. The systemctl is-active --quiet kubelet command will succeed (exit code 0) if kubelet is active and running. If not, it logs an error message and exits the script with code 1, indicating failure.

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Testing Done

All test recommended in testing-changes passed.