Align default parameter handling

[MariusStorhaug]

Need a separate snippet or function to take care of defaults from the function, basically merging $PSBoundParameters and $PSCmdlet.Parameters (or something of the likes) to get the defaults if not provided in $PSBoundParameters. This will make it so that the default actually get used in the body for API calls.

Something like:

    $PSCmdlet.MyInvocation.MyCommand.Parameters.GetEnumerator() | ForEach-Object {
        $paramName = $_.Key
        $paramDefaultValue = Get-Variable -Name $paramName -ValueOnly -ErrorAction SilentlyContinue
        $providedValue = $PSBoundParameters[$paramName]
        Write-Verbose "[$paramName]"
        Write-Verbose "  - Default:  [$paramDefaultValue]"
        Write-Verbose "  - Provided: [$providedValue]"
        if (-not $PSBoundParameters.ContainsKey($paramName) -and ($null -ne $paramDefaultValue)) {
            Write-Verbose '  - Using default value'
            $PSBoundParameters[$paramName] = $paramDefaultValue
        } else {
            Write-Verbose '  - Using provided value'
        }
    }

    $body = $PSBoundParameters | ConvertFrom-HashTable | ConvertTo-HashTable -NameCasingStyle snake_case
    Remove-HashtableEntry -Hashtable $body -RemoveNames 'Owner', 'Repo' -RemoveTypes 'SwitchParameter'