🩹 [Patch]: Add tests for Get-GitHubUser and Set-GitHubUser (#237)

## Description

- Add tests for `Get-GitHubUser` and `Set-GitHubUser`

## Type of change

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [ ] 📖 [Docs]
- [ ] 🪲 [Fix]
- [x] 🩹 [Patch]
- [ ] ⚠️ [Security fix]
- [ ] 🚀 [Feature]
- [ ] 🌟 [Breaking change]

## Checklist

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas

Author: MariusStorhaug

src/functions/public/Users/Get-GitHubUserCard.ps1 renamed to src/functions/private/Users/Get-GitHubUserCard.ps1

@@ -17,11 +17,11 @@
         ```
 
         .EXAMPLE
+        Get-GitHubUserCard -Username 'octocat' -SubjectType 'repository' -SubjectID 1300192
 
         .NOTES
         [Get contextual information for a user](https://docs.github.com/rest/users/users#get-contextual-information-for-a-user)
     #>
-    #SkipTest:FunctionTest:Will add a test for this function in a future PR
     [OutputType([pscustomobject])]
     [CmdletBinding()]
     param(

src/functions/public/Auth/Connect-GitHubApp.ps1

@@ -34,6 +34,7 @@
         .NOTES
         [Authenticating to the REST API](https://docs.github.com/rest/overview/other-authentication-methods#authenticating-for-saml-sso)
     #>
+    #SkipTest:FunctionTest:Will add a test for this function in a future PR
     [OutputType([void])]
     [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingWriteHost', '', Justification = 'Is the CLI part of the module.')]
     [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingConvertToSecureStringWithPlainText', '',

src/functions/public/Users/Get-GitHubUser.ps1

@@ -26,14 +26,13 @@
         .NOTES
         [Get the authenticated user](https://docs.github.com/rest/users/users)
     #>
-    #SkipTest:FunctionTest:Will add a test for this function in a future PR
     [OutputType([pscustomobject])]
     [Diagnostics.CodeAnalysis.SuppressMessageAttribute(
         'PSReviewUnusedParameter',
         'All',
         Justification = 'Parameter is used in dynamic parameter validation.'
     )]
-    [CmdletBinding(DefaultParameterSetName = '__DefaultSet')]
+    [CmdletBinding(DefaultParameterSetName = '__AllParameterSets')]
     param(
         # The handle for the GitHub user account.
         [Parameter(
@@ -75,7 +74,7 @@
     process {
         try {
             switch ($PSCmdlet.ParameterSetName) {
-                '__DefaultSet' {
+                '__AllParameterSets' {
                     $user = Get-GitHubMyUser -Context $Context
                     $social_accounts = Get-GitHubMyUserSocials -Context $Context
                     $user | Add-Member -MemberType NoteProperty -Name 'social_accounts' -Value $social_accounts -Force

src/functions/public/Users/Set-GitHubUser.ps1

@@ -26,7 +26,6 @@
         .NOTES
         [Update the authenticated user](https://docs.github.com/rest/users/users#update-the-authenticated-user)
     #>
-    #SkipTest:FunctionTest:Will add a test for this function in a future PR
     [OutputType([void])]
     [Alias('Update-GitHubUser')]
     [CmdletBinding(SupportsShouldProcess)]
@@ -88,6 +87,7 @@
                 hireable         = $Hireable
                 bio              = $Bio
             }
+            $body | Remove-HashtableEntry -NullOrEmptyValues
 
             $inputObject = @{
                 Context     = $Context