Aggregate spec examples to enable RSpec/AggregateExamples globally

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The cop looks for opportunities to squash spec examples: https://www.rubydoc.info/gems/test-prof/0.11.2/RuboCop/Cop/RSpec/AggregateExamples

# bad
describe do
  specify do
    expect(number).to be_positive
    expect(number).to be_odd
  end

  it { is_expected.to be_prime }
end

# good
describe do
  specify do
    expect(number).to be_positive
    expect(number).to be_odd
    is_expected.to be_prime
  end
end

# fair - subject has side effects
describe do
  specify do
    expect(multiply_by(2)).to be_multiple_of(2)
  end

  specify do
    expect(multiply_by(3)).to be_multiple_of(3)
  end
end

It has been introduced in !42318 (closed) and has been disabled by default. The roll-out plan is to specify a file or directory to the Include section of the cop and auto-correct (or fix) the existing offenses.

MRs