Remove Library variable set references from all projects

script.ps1

#Config
$OctopusAPIKey = ""
$OctopusURL = ""
$header = @{ "X-Octopus-ApiKey" = $OctopusAPIKey }

#Library Variable Set (LVS) to remove from projects
$LibraryVariableSetIDs = ("LibraryVariableSets-1","LibraryVariableSets-2")

#Getting all the projects on the Octopus instance
$AllProjects = Invoke-WebRequest "$OctopusURL/api/projects/all" -Headers $header | select -ExpandProperty Content | ConvertFrom-Json

#Getting the projects that are using the deleted LVS
$ProjectsToUpdate = $AllProjects | ?{$_.IncludedLibraryVariableSetIds -contains $LibraryVariableSetID}

#Printing projects to update
$ProjectsToUpdate.Name

#Loop to fix projects
foreach ($project in $ProjectsToUpdate){
    Try{
        Write-output "Updating project $($project.Name)"
        #Removing all LVS from the project
        [System.Collections.ArrayList]$ids = $Project.IncludedLibraryVariableSetIds

        foreach($LibraryVariableSetID in $LibraryVariableSetIDs){
            if($LibraryVariableSetID -in $ids){
                $ids.Remove($LibraryVariableSetID)
            }

            }
        #$ids.Remove($LibraryVariableSetID)
        $project.IncludedLibraryVariableSetIds = $ids
        #Saving changes on server
        Invoke-WebRequest "$OctopusURL/api/projects/$($Project.id)" -Method PUT -Headers $header -Body ($project | ConvertTo-Json -Depth 4)
    }
    Catch{
        $_
    }
}