Fix more tests related to Rails 7.1 upgrade

What does this MR do and why?

Related:

• https://handbook.gitlab.com/handbook/engineering/architecture/design-documents/rails_upgrade
• Move test fixes out of the Rails 7.1 Upgrade MR (#475085 - closed)

Fixes:

• Fix ee/spec/features/groups/analytics/productivity_analytics_spec.rb
• Define default_timezone for ClickHouseHelpers
• Fix spec/requests/oauth/tokens_controller_spec
• Use BroadcastLogger instead of ActiveSupport::Logger.broadcast
• Fix with_lock_retries_spec that hangs
• Kas::UserAccess: set request to controller that checks csrf
• Stub clock_gettime with values called by Rails
• Handle zettabytes in storage helper specs