RuboCop: Disable Layout/HashAlignment

What does this MR do and why?

This MR disables 👮 rule Layout/HashAlignment because it causes warnings like https://gitlab.com/gitlab-org/gitlab/-/jobs/3515923572 and generating TODOs has no effect (see !107679 (merged)).

Note that this rule only has 2 offenses (one in todo YAML and the other is spec/serializers/environment_serializer_spec.rb which causes problems) so having this cop disabled seems fair for now.

See #386618 (closed) for more info.

How to verify locally?

unset REVEAL_RUBOCOP_TODO
bundle exec rubocop spec/serializers/environment_serializer_spec.rb
Inspecting 1 file
.

1 file inspected, no offenses detected

MR acceptance checklist

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