refactor(sharepoint): streamline tenant selection and deployment process

- Updated backend to require a single tenant for template deployment, enhancing clarity and reducing complexity.
- Adjusted frontend to reflect the change from multiple tenant selection to a single tenant context, ensuring the Site/Team Owner picker is appropriately scoped.
- Improved logging and messaging to accurately represent the deployment status for the selected tenant.

Synced from CyberDrain/CIPP@0aa759a

Author: github-actions[bot]

Modules/CIPPHTTP/Public/Entrypoints/HTTP Functions/Teams-Sharepoint/Invoke-ExecSharePointTemplate.ps1

@@ -136,45 +136,38 @@ function Invoke-ExecSharePointTemplate {
                 $TemplateData = $Template.JSON | ConvertFrom-Json
                 if (-not $SiteOwner) { throw 'A site/team owner is required to deploy this template.' }
 
-                # Expand AllTenants when selected in the drawer.
-                $Tenants = foreach ($Tenant in $Request.Body.selectedTenants) {
-                    if ($Tenant.defaultDomainName -eq 'AllTenants') {
-                        (Get-Tenants).defaultDomainName
-                    } else {
-                        $Tenant.defaultDomainName
-                    }
+                $TenantFilter = $Request.Body.tenantFilter
+                if ([string]::IsNullOrWhiteSpace($TenantFilter)) {
+                    throw 'A tenant is required to deploy this template.'
                 }
-                $Tenants = @($Tenants | Sort-Object -Unique)
 
-                # Pre-create a status row per tenant so the frontend can poll live progress
-                # (GDAP-onboarding style) from the moment the deployment is queued.
-                $JobId = New-CIPPAsyncDeployment -Names $Tenants -StepTitles @(@($TemplateData.siteTemplates) | ForEach-Object { $_.displayName }) -Source 'SharePointTemplate'
+                # Pre-create a status row so the frontend can poll live progress from queue time.
+                $JobId = New-CIPPAsyncDeployment -Names @($TenantFilter) -StepTitles @(@($TemplateData.siteTemplates) | ForEach-Object { $_.displayName }) -Source 'SharePointTemplate'
 
                 # Site and Team provisioning is slow (Teams sites can take a minute each), so the
-                # actual work runs per tenant on the durable queue instead of in this request.
-                $Queue = New-CippQueueEntry -Name "SharePoint Template - $($TemplateData.templateName)" -TotalTasks $Tenants.Count
-                $Batch = foreach ($TenantFilter in $Tenants) {
-                    [pscustomobject]@{
-                        FunctionName = 'ExecSharePointTemplateDeploy'
-                        Tenant       = $TenantFilter
-                        TemplateId   = $TemplateId
-                        SiteOwner    = $SiteOwner
-                        DeploymentId = $JobId
-                        QueueId      = $Queue.RowKey
-                    }
-                }
+                # actual work runs on the durable queue instead of in this request.
+                $Queue = New-CippQueueEntry -Name "SharePoint Template - $($TemplateData.templateName)" -TotalTasks 1
                 $InputObject = @{
                     OrchestratorName = 'SharePointTemplateOrchestrator'
-                    Batch            = @($Batch)
+                    Batch            = @(
+                        [pscustomobject]@{
+                            FunctionName = 'ExecSharePointTemplateDeploy'
+                            Tenant       = $TenantFilter
+                            TemplateId   = $TemplateId
+                            SiteOwner    = $SiteOwner
+                            DeploymentId = $JobId
+                            QueueId      = $Queue.RowKey
+                        }
+                    )
                     SkipLog          = $true
                 }
                 $null = Start-CIPPOrchestrator -InputObject $InputObject
 
                 $Body = @{
-                    Results      = "Deployment of template '$($TemplateData.templateName)' queued for $($Tenants.Count) tenant(s)."
+                    Results      = "Deployment of template '$($TemplateData.templateName)' queued for $TenantFilter."
                     DeploymentId = $JobId
                 }
-                Write-LogMessage -headers $Headers -API $APIName -message "Queued SharePoint template deployment '$($TemplateData.templateName)' for $($Tenants.Count) tenant(s)" -Sev 'Info'
+                Write-LogMessage -headers $Headers -API $APIName -message "Queued SharePoint template deployment '$($TemplateData.templateName)' for $TenantFilter" -Sev 'Info'
             } catch {
                 $Body = @{ Results = "Failed to queue template deployment: $($_.Exception.Message)" }
                 $StatusCode = [HttpStatusCode]::BadRequest