Add Skip Not Applicable Flag to audit and scan commands

[dortam888]

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• The code has been validated to compile successfully by running go vet ./....
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• All static analysis checks passed.
• All tests have passed. If this feature is not already covered by the tests, new tests have been added.
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• All changes are detailed at the description. if not already covered at JFrog Documentation, new documentation have been added.

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Add skip-not-applicable flag to docker scan and audit command to show results of scan without not applicable cves