additional git url validations

[rcerven]

allow trailing '/' in git url and strip it in the code

for github allow only 2 parts in the path:
https://github.com/owner/reponame
when creating repo in github and repo name contains '/' github converts it to '-'

for gitlab don't allow '-' in the path because that is used for
commits/tree/blob etc
but allow more than 2 parts in the path as gitlab allows that

STONEBLD-3181
STONEBLD-3215

Checklist:

• PR has reference to the issue(s) it resolves
• Write / update unit tests
• Write / update integration (envtest) tests
• Ensure there is an issue for e2e tests if needed
• Ensure make test passes
• Ensure test coverage hasn't decreased
• Test code changes manually
• Update readme and documentation
• Write PR description that highlights overall changes and add usage examples if applicable