[ADF-5432] component template and code fixes after testing Angular strict mode (#7118)

* process list fixes

* template error fixes

* template and code fixes

* bug fixes in templates and types

* bugs, bugs are everywhere

* fix test

* test fixes

* enable strict templates for extensions lib

* enable strict mode for insights lib

* enable strict mode for core lib

* enable strict mode for content lib

* strict mode for process lib

* strict mode for process cloud

* fix demo shell template issues

* fix process cloud types

lib/core/layout/components/header/header.component.ts

@@ -16,6 +16,7 @@
  */
 
 import { Component, Input, Output, EventEmitter, ViewEncapsulation, OnInit } from '@angular/core';
+import { ThemePalette } from '@angular/material/core';
 
 @Component({
     selector: 'adf-layout-header',
@@ -40,7 +41,7 @@ export class HeaderLayoutComponent implements OnInit {
      * Background color for the header. It can be any hex color code or one
      * of the Material theme colors: 'primary', 'accent' or 'warn'.
      */
-    @Input() color: string;
+    @Input() color: ThemePalette;
 
     /**
      * Toggles whether the sidenav button will be displayed in the header