Fix module resolution issue when importing action constants

[BBlackwo]

During the Angular 13 upgrade the build broke when doing an import from @ngrx/store:

import {
    INIT as INIT_ACTION,
    UPDATE as UPDATE_ACTION
} from '@ngrx/store';

The issue has to do with conflicting module resolution (CommonJS Modules vs ES Modules) see #208 (comment) for more info.

As a temporary workaround we have removed the import and hardcoded the action constants in d720252.

This issue is to put back the import and fix the module resolution. Some ideas:

• Configure Jasmine to support ESM
• Upgrade to the latest Jasmine
• Move to a different testing library such as Jest