Do not sync network policy for invalid accounts

[reachjainrahul]

Describe the bug

If cloud credentials expired, sync with cloud in network policy will return empty content and the np controller will try to re-sync network policy, resulting in failure again, as account credentials are valid.

To Reproduce

• Add valid credentials
• Delete credentials or let the credentials expire
• Wait for sync with cloud to kick in
• Observe failure while re-syncing

Expected

• Avoid syncing network policies for invalid accounts

Versions:

v0.6.0

[github-actions]

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