Introduce Validation for Supported Yarn Versions

[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.

---

depends on:

1. Verify supported Yarn version jfrog-cli-core#1347

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[fluxxBot]

I have read the CLA Document and I hereby sign the CLA

[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

[EyalDelarea]

Hey @fluxxBot,

I've added my review, please let's also update the title of the PR as we would expect it to appear in the release notes.

Something like :Introduce Validation for Supported Yarn Versions
which in my opinion better describe the new code that is being added here.

Let me know what you think 👍