Send notification for joining an engagement

[jobara]

Is your feature request related to a problem? Please describe.

Currently there's only a flash notice when a consultation participant joins an engagement. Some users were confused about if they had successfully signed up.

Describe the solution you'd like

In addition to the flash message, send a notification (e-mail and dashboard) the they have joined the engagement. Should probably also send a notification if they leave the engagement.

Describe alternatives you've considered

No response

Additional context

No response

[jobara]

A notification for joining would need to be added here

platform/app/Http/Controllers/EngagementController.php

Lines 623 to 632 in e945631

	public function join(Request $request, Engagement $engagement): RedirectResponse
	{
	$engagement->participants()->save(Auth::user()->individual, ['status' => 'confirmed']);
	$engagement->project->notify(new ParticipantJoined($engagement));
	flash(__('You have successfully signed up for this engagement.'), 'success|'.__('You have successfully signed up for this engagement.', [], 'en'));
	return redirect(localized_route('engagements.confirm-access-needs', $engagement));
	}

[jobara]

A notification for leaving an engagement could be added here:

platform/app/Http/Controllers/EngagementController.php

Lines 706 to 715 in e945631

	public function leave(Request $request, Engagement $engagement): RedirectResponse
	{
	Auth::user()->individual->engagements()->detach($engagement->id);
	$engagement->project->notify(new ParticipantLeft($engagement));
	flash(__('You have successfully left this engagement.'), 'success|'.__('You have successfully left this engagement.', [], 'en'));
	return redirect(localized_route('engagements.show', $engagement));
	}