Migrate ioBroker.ping tests to @iobroker/testing library

[Copilot]

The existing integration tests were not using the @iobroker/testing harness and failed in sandboxed/Docker environments where the ping binary is unavailable.

Changes

test/integration.js

• Restructured into three focused suites using tests.integration + defineAdditionalTests:
  • startup and state creation – adapter starts, correct objects created
  • state values – localhost always tested; google.com and unreachable-IP checks gated on process.env.CI
  • GUI – Puppeteer browser test, opt-in via TEST_GUI=1

test/unit.js

• Regular ping test now skips gracefully on ENOENT (ping binary absent in restricted environments)

ping.probe('127.0.0.1', { log: () => {}, minReply: 1 }, (err, result) => {
    if (err && err.message && err.message.includes('ENOENT')) {
        this.skip();
        return;
    }
    expect(result.alive).to.be.true;
});

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