for the applications table set the defaults for app_instance and app_instance to '' (#15278)

* add migration file for new defaults for applications table

* update the db_schema yaml and tweak the migration so it does not change the varchar size for app_status

database/migrations/2023_09_01_084057_application_new_defaults.php

@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class ApplicationNewDefaults extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('applications', function (Blueprint $table) {
+            $table->string('app_instance')->default('')->change();
+            $table->string('app_status', 1024)->default('')->change();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('applications', function (Blueprint $table) {
+            $table->string('app_instance')->default(null)->change();
+            $table->string('app_status', 1024)->default(null)->change();
+        });
+    }
+}