Create Unit tests for Fileset functions

[jaapbrasser]

There are currently no unit tests for these functions, proper unit tests should be written for these functions so we can make this part of the CI/CD pipeline. This will provide more confidence when writing additional functionality or fixing bugs in the module.

Unit tests should be created for the following functions:

• Get-RubrikFileset
• Get-RubrikFilesetTemplate
• New-RubrikFileset
• New-RubrikFilesetTemplate
• Protect-RubrikFileset
• Remove-RubrikFileset
• Get-RubrikNASShare
• New-RubrikNASShare
• Remove-RubrikNASShare
• Set-RubrikNASShare

Describe alternatives you've considered

Manually testing function when adding functionality