Added rubocop extensions

[tungleduyxyz]

Related issue: killbill/killbill-admin-ui#345

[Copilot]

Pull request overview

Updates linting support by enabling additional RuboCop extension packs and applies small Rails code modernizations/cleanups to align with the new cops.

Changes:

• Add RuboCop extension gems (Rails, RSpec, Performance, ThreadSafety) and enable/configure them in .rubocop.yml (incl. Ruby 3.2 target).
• Modernize a few Rails patterns (routing DSL match → get/put, blank?/present? usage, Time.zone.today, keyword shorthand).
• Adjust a placeholder controller test base class to ActionDispatch::IntegrationTest.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Gemfile	Adds RuboCop extension gems to support new lint rule sets.
.rubocop.yml	Requires/enables RuboCop extensions and configures Rails/RSpec/Performance/ThreadSafety departments and Ruby target version.
config/routes.rb	Replaces match ... via: routes with explicit get/put.
app/helpers/kanaui/dashboard_helper.rb	Minor conditional cleanup using present?.
app/controllers/kanaui/dashboard_controller.rb	Timezone-aware date defaulting and small parameter/keyword cleanups.
app/controllers/kanaui/reports_controller.rb	Method ordering change only (no functional change).
test/test_helper.rb	Small change to support-file requiring loop.
test/functional/kanaui/tests_controller_test.rb	Updates test superclass to integration test.

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