Update some specs to pass with the super sidebar

What does this MR do and why?

Update some specs to pass with the super sidebar

Updates a bunch of specs to pass when the super sidebar is enabled.

Screenshots or screen recordings

No visual change.

How to set up and validate locally

bundle exec rspec ee/spec/features/protected_tags_spec.rb
bundle exec rspec ee/spec/features/subscriptions/subscription_flow_for_existing_user_with_eligible_group_spec.rb
bundle exec rspec ee/spec/features/trials/saas/creation_with_multiple_existing_namespace_flow_spec.rb
bundle exec rspec ee/spec/features/trials/saas/creation_with_no_existing_namespace_flow_spec.rb
bundle exec rspec ee/spec/features/trials/saas/creation_with_one_existing_namespace_flow_spec.rb
bundle exec rspec ee/spec/requests/search_controller_spec.rb
bundle exec rspec ee/spec/services/vulnerabilities/security_finding/create_merge_request_service_spec.rb
bundle exec rspec ee/spec/views/layouts/application.html.haml_spec.rb

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.