skip-folders flag

[orto17]

• 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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The purpose of this PR:

• Adding a new flag: "skip-folders" to the audit command.
• This flag determines which folders will not be scanned by Jas scanners.
• When the user is not using this flag, the default value is (same as in vs code): "/test/", "/venv/", "/node_modules/", "/target/"

[eyalbe4]

@orto17 -
Will you be able to add a clear description for this PR, so that everyone understands its goals and function?
Sage goes for jfrog/jfrog-cli-core#832.
These PRs receive hight visibility and should therefore be clear for all readers.