Kyverno CLI test command on Git repos default to main branch

[chipzoller]

Is your feature request related to a problem? Please describe.
The Kyverno CLI, when using the test command with an upstream git repository, requires the format of that repo contain the branch name. This isn't aligned with about all software today which can default to pick up the main or master branch.

Describe the solution you'd like
When using the test command of the CLI to test against a web-server-backed Git repo, default to using the main branch (or master if main is not present). Users should be able to point the CLI like so: kyverno test https://github.com/kyverno/policies
Additionally, if both master and main are found, prefer main and print a message back to the console stating this.

[vyankyGH]

@chipzoller Currently we don't have logic to fetch branch from given Git repo to pick up the main or master branch.
Kyverno test command validate given Url is correct or not. Repo and branch is present or not.
As you suggested, if user doesn't mention branch name in Url, By default I'm setting to main.
(kyverno test https://github.com/kyverno/policies/) .
Also you can test with any another branch name also (test https://github.com/kyverno/policies/add_sample_policy )
It will get fix once PR merged.