test: Migrate away from karma

Author: manthey

.github/workflows/main.yml

@@ -32,6 +32,7 @@ jobs:
     - run: firefox --version
     - run: google-chrome --version
     - run: npm ci
+    - run: npm run install-test-browsers
     - run: npm run setup-website
     - run: npm run ci-xvfb
     - run: npm run validate-es5

.gitignore

@@ -17,3 +17,4 @@
 /jsdoc/template/tmpl
 /jsdoc/template/static
 /images/*
+test-results/*

eslint.config.js

@@ -98,7 +98,7 @@ module.exports = [
       'no-console': 'error',
     }
   }, {
-    files: ['tutorials/**', 'examples/**', 'tests/**', 'scripts/**', 'plugins/**', 'karma*.*', 'jsdoc/**'],
+    files: ['tutorials/**', 'examples/**', 'tests/**', 'scripts/**', 'plugins/**', 'jsdoc/**'],
     rules: {
       'jsdoc/check-param-names': 'off',
       'jsdoc/check-tag-names': 'off',