Update web login prompts

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

Revise the web login commands errors (jf login & jf c add with Web Login) to advise executing jf c add if the Artifactory version is below 7.64.0.

jfrog / jfrog-cli-core

Update web login prompts #1178

[x] I used gofmt for formatting the code before submitting the pull request.