Restrict user from using yarn v4

[fluxxBot]

• 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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depends on:

1. Restrict user from using yarn v4 jfrog-cli-core#1347

[github-actions]

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[fluxxBot]

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[fluxxBot]

1. Added error message when user trying to upgrade to v4 in yarn
2. Allowed user to change the version irrespective of which version being currently used
3. Allowed user to check version irrespective of which version being currently used
4. Added check when a user tries to fetch config get which returns undefined in the newer yarn version
5. Prevents user from switching to version v4 of yarn

[bhanurp]

Since minimum supported yarn version in 2.X.X, when version is set to anything below that should fail. Is that happening ? Could you please add a case and check if not

[fluxxBot]

above test is written only to skip version check when switching back and forth from an unsupported version, say switching back to lower versions from v4, currently you can switch back to a lower unsupported version say 1.x.x but you won't be able to switch back from it