Place shared examples in the support folder

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In https://gitlab.com/gitlab-org/gitlab/-/merge_requests/191481 we enabled the Gitlab/RSpec/SharedExamplesPlacement cop which requires our Rspec.shared_examples to be placed in the support folder. Inline definitions without Rspec constant can be used in the same file.

Implementation Plan

• For each of the following files (.rubocop_todo/gitlab/rspec/shared_examples_placement.yml), understand the cop purpose by looking at the specs.
• Switch to inline shared example in case of single file usage.
• Or place shared examples in spec/support/shared_examples/ or ee/spec/support/shared_examples/
• Run bundle exec rubocop --only Gitlab/RSpec/SharedExamplesPlacement and ensure there are no errors.