Add mailer specs as well.

The linter complains with "ViewLength: View template is too long".
As there will be a refactoring soon, we can exclude it for now.
It's added to .haml-lint_todo.yml with `haml-lint --auto-gen-config`.

Filter member_on_groups include both added and removed users.

For both AddedUserToGroup and RemovedUserFromGroup (which was missing
before).

Also add the new type of notifiable: GroupsUser.

Mention who in subject. It might not exist if it was the application and
not a user who added the user. That happens in request acceptance, for
example.

There is no need to pass the whole object to the event payload, we can
retrieve the object later.

Same for Group#title.

Events: AddedUserToGroup and RemovedUserFromGroup.

Ignore non-sensical parameters on the search

Refactoring PackageControllerService::RebuildTrigger away

Fix WorkflowArtifactsPerStepComponent previews

Fix the SourceDiff component preview

Make Tumbleweed builds work in development environment

Also makes all the "trigger" actions look/behave the same...

And replace it with a standard...

- before filter
- begin/rescue in a controller method

Creating thi wrong project ('openSUSE.org:openSUSE:Tumbleweed')
prevented from building Tumbleweed packages in the development
environment.

[src/api] Update rexml 3.2.9 → 3.3.0 (minor)

[src/api] Update rubocop-rspec 2.30.0 → 2.31.0 (minor)

Improve query to check involved item user roles

Git ignore .ackrc

Prevent from performing N+1 queries.

Also use one style to reference to specific files.

Remove redundant issue trackers check for enabled