PMM-14655 Send events when service is added & settings are changed

[matejkubinec]

PMM-14655

FB: SUBMODULES-4167

Related PRs:

• PMM-14655 Add listeners for settings change and service added pmm#4858

[dmitri-saricev-3pillargloball]

The SettingsUpdatedEvent is published even if fetchSettingsAction fails:

const settings = await SettingsService.setSettings(args.body, args.token, true);
await thunkAPI.dispatch(fetchSettingsAction({ usedPassword: password, testEmail }));
appEvents.publish(new SettingsUpdatedEvent()); // fires even if fetch fails

This means listeners will think settings were updated successfully even when they weren't. We should only publish the event if everything succeeds:

const settings = await SettingsService.setSettings(args.body, args.token, true);
const result = await thunkAPI.dispatch(fetchSettingsAction({ usedPassword: password, testEmail }));

if (result.type === fetchSettingsAction.fulfilled.type) {
appEvents.publish(new SettingsUpdatedEvent());
}

[matejkubinec]

Actual settings update is via setSettings so notifying the PMM UI about the changed even if the fetch on the Grafana side fails makes sense to me.