feat: configure playwright to test other examples based on env var

[weboko]

This is a feature request

Problem

In #1418 Playwright was configured to extract and test only one example which is web-chat.
We have other examples that are worth shallow testing in the browser - a reason for that is to check the compatibility of js-waku with different Fron-End frameworks.

Proposed Solutions

By passing env variables we can re-configure Pralywright CI to test other examples as well.
A new set of tests can be written for other examples and should be run dependently on an example under testing.

Subtasks

• Configure Playwright CI to be an action for re-usability reasons;
• Make bootstrap scripts example agnostic;
• Write new set of test for other examples if needed;
• Add CI stages to test different examples;

Notes

Refs: waku-org/pm#90