Support auto-quarantining single-line examples and examples without a description

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Problem

Currently, the automated quarantining of flaky tests only works for full it examples, e.g.

it 'example description' do
  expect { subject }.to be(true)
end

Single-line example such as #444694 (closed):

it { is_expected.to eq(secondary_node) }

And example without a description such as

it do
  expect { subject }.to be(true)
end

cannot be quarantined.

The problem is that even if we detect the two latter cases, we'll need to reformat them to a full it example, with a description (maybe '' would work as a description...).

Resources

Edited by 🤖 GitLab Bot 🤖