GKE integrate NetworkPolicy check to quarantining process

[zkck]

Primary reason for this PR is integrating a NetworkPolicy check to the quarantining process, i.e. disabling the Isolate pods? option appropriately.

Additionally, this PR adds a few small changes:

• To disable a PromptOption, a reason for disabling is now required
• Fix a bug in which a workload's nodes may appear twice, by introducing a K8sWorkload.GetCoveredNodes method
• Add workaround to pod isolation when deleting workload
• Add appropriate defaults to the yes/no prompt options
• Fix strikethrough function
• Fix wrong string argument

[codecov-commenter]

Codecov Report

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  Hits            ?     2161           
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