chore: add MPL license headers to all source files (#2977)

src/app/clients/client-stepper/client-datatable-step/client-datatable-step.component.html

@@ -1,3 +1,11 @@
+<!--
+  Copyright since 2025 Mifos Initiative
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+-->
+
 <form [formGroup]="datatableForm">
   <div class="layout-row-wrap gap-2px responsive-column">
     @for (datatableInput of datatableInputs; track datatableInput) {

src/app/clients/client-stepper/client-datatable-step/client-datatable-step.component.scss

@@ -1,3 +1,11 @@
+/**
+ * Copyright since 2025 Mifos Initiative
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 .date-picker {
   width: 92%;
 }

src/app/clients/client-stepper/client-datatable-step/client-datatable-step.component.ts

@@ -1,3 +1,11 @@
+/**
+ * Copyright since 2025 Mifos Initiative
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 import { Component, Input, OnInit, inject } from '@angular/core';
 import {
   UntypedFormBuilder,