Add start date-time picker to alert configuration

Introduces a date-time picker for specifying the desired start time of an alert. The start time is parsed from the alert data if available and included in form state and submission payload.

Author: Zacgoose

src/pages/tenant/administration/alert-configuration/alert.jsx

@@ -132,13 +132,21 @@ const AlertWizard = () => {
           };
         }
 
+        // Parse the original desired start date-time from DesiredStartTime field if it exists
+        let startDateTimeForForm = null;
+        if (alert.RawAlert.DesiredStartTime && alert.RawAlert.DesiredStartTime !== "0") {
+          const desiredStartEpoch = parseInt(alert.RawAlert.DesiredStartTime);
+          startDateTimeForForm = desiredStartEpoch;
+        }
+
         // Create the reset object with all the form values
         const resetObject = {
           tenantFilter: tenantFilterForForm,
           excludedTenants: excludedTenantsFormatted,
           command: { value: usedCommand, label: usedCommand.label },
           recurrence: recurrenceOption,
           postExecution: postExecutionValue,
+          startDateTime: startDateTimeForForm,
         };
 
         // Parse Parameters field if it exists and is a string
@@ -332,6 +340,7 @@ const AlertWizard = () => {
       Command: { value: `Get-CIPPAlert${values.command.value.name}` },
       Parameters: getInputParams(),
       ScheduledTime: Math.floor(new Date().getTime() / 1000) + 60,
+      DesiredStartTime: values.startDateTime ? values.startDateTime.toString() : null,
       Recurrence: values.recurrence,
       PostExecution: values.postExecution,
     };
@@ -700,6 +709,15 @@ const AlertWizard = () => {
                                 options={recurrenceOptions} // Use the state-managed recurrenceOptions here
                               />
                             </Grid>
+                            <Grid size={12}>
+                              <CippFormComponent
+                                type="datePicker"
+                                name="startDateTime"
+                                formControl={formControl}
+                                label="When should the first alert run?"
+                                dateTimeType="datetime"
+                              />
+                            </Grid>
                             <Grid size={12}>
                               {commandValue?.value?.requiresInput && (
                                 <CippFormComponent