[ADF-5456] improved theming bundling (#7180)

* theming barrel file for core

* card-view theme

* clipboard theme

* rename core theme files

* content services themes

* process services theme

* process services cloud theme

* insights theming

* try fix flaky test

lib/content-services/ng-package.json

@@ -1,6 +1,11 @@
 {
   "$schema": "../../node_modules/ng-packagr/ng-package.schema.json",
   "dest": "../dist/content-services",
+  "assets": [
+    "./src/lib/styles/**/*.scss",
+    "./theming/**/*.scss",
+    "./src/**/*.theme.scss"
+  ],
   "lib": {
     "entryFile": "src/public-api.ts",
     "flatModuleFile": "adf-content-services",