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Deviceplugin refactoring: cleanup some unnecessary functions

**What this PR does / why we need it**:
cleanup some of unnecessary functions of deviceplugin to improve code readability 

**Which issue this PR fixes** 
 fixes #51993 
Part1

**Special notes for your reviewer**:
Currently, it seems that func `IsResourceNameValid` is not used outside and could be changed to internal.
But as Renaud commented, it is designed for potential usage from users outside. 
And I could not find a better position to place the func, except for file `utils.go`. So, shall we just retain the `utils.go` file, and maybe for possible expansion in the future?

/cc @jiayingz @RenaudWasTaken @vishh 

**Release note**:

```release-note
NONE
```