fix: validate and preprocess version in FindSemVerInfo

[yxxhero]

This pull request improves the robustness and usability of the FindSemVerInfo utility function by handling empty and non-prefixed version strings, and updates the related tests to reflect the new behavior.

Enhancements to version string handling:

• Updated FindSemVerInfo in util.go to return an error if the input version string is empty and to automatically add a v prefix if it's missing before extracting the semantic version.

Test updates:

• Modified the test case in util_test.go to expect a valid semver result when the version string does not start with v, reflecting the new logic in FindSemVerInfo.