Remove Security content

[attiasas]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• All static analysis checks passed.
• This pull request is on the dev branch.
• I used gofmt for formatting the code before submitting the pull request.

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Refactor security-related content that will be moved to https://github.com/jfrog/jfrog-cli-security
the content that was removed will be added at: jfrog/jfrog-cli-security#3

[github-actions]

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