Enable RSpec/ReceiveNever cop

What does this MR do and why?

This MR enables the RSpec/ReceiveNever cop, which is enabled by default in rubocop-rspec. The auto-correction was run to fix existing offences.

Related to #42182 (closed)

Screenshots or screen recordings

# bad
expect(foo).to receive(:bar).never

# good
expect(foo).not_to receive(:bar)

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.