Add karma, and ng test runners

[gayanW]

NOTE: Make sure to merge backend changes before merging CLI changes:
https://github.com/launchableinc/mothership/pull/12710

How to test

Start by creating sample Angular project with Karma and Jasmine:

The below instructions are based on:
https://angular.dev/guide/testing/karma
https://www.npmjs.com/package/karma-json-reporter

ng new my-karma-app --test-runner=karma
cd my-karma-app
npm install --save-dev karma karma-chrome-launcher karma-coverage karma-jasmine karma-jasmine-html-reporter jasmine-core @types/jasmine
ng test --no-watch --no-progress --browsers=ChromeHeadless

Configure Json reporter

npm install --save-dev karma-json-reporter
ng generate config karma

Add following to karma.conf.js while keeping the current settings:

module.exports = function (config) {
  config.set({
    ...
    plugins: [
      ...
      require('karma-json-reporter')
    ],
    jsonReporter: {
      outputFile: require('path').join(__dirname, 'test-results.json'),
      stdout: false
    },
    reporters: [..., 'json']
  });
};

Record session:

git add . && git commit -m "Initial commit"
launchable record build --name ${BUILD_NAME}
launchable record session --build ${BUILD_NAME} > session.txt

Record tests with karma:

ng test --no-watch --no-progress --browsers=ChromeHeadless
launchable record tests karma test-results.json

Subset tests with ng:

ng test --list-tests | grep src > test_list.txt
cat test_list.txt | launchable subset --target 25% ng > subset.txt

Run subset of tests

ng test --no-watch --no-progress --browsers=ChromeHeadless --include $(cat subset.txt)

If this gets merged, I'll create a sample project in smart-tests-integration-examples with a README containing the above instructions.