Remove skip vue 3 helper

What does this MR do and why?

Remove skip vue 3 helper

It is no longer used in code base

This code change completely removes a testing utility file that was designed to conditionally skip certain tests when using Vue.js version 3. The file contained helper functions that would automatically skip specific tests if Vue 3 was being used (unless a special flag was provided), allowing developers to temporarily disable tests that weren't compatible with the newer Vue version. By deleting this file, the codebase is likely moving away from conditional test skipping, possibly because Vue 3 compatibility issues have been resolved or because they're adopting a different testing strategy.

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Related to #582103