Fix panic in build-scan without arguments

[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.

Resolve https://github.com/jfrog/jfrog-cli/issues/2424

The build name and build-number arguments can be supplied via environment variables. buildConfiguration.GetBuildName() and buildConfiguration.GetBuildNumber() are handling these cases. Hence, it also makes sense not to include any arguments in this command.

jfrog / jfrog-cli-core

Fix panic in build-scan without arguments #1130

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