Only use rspec-retry for features (system) specs

Lin Jen-Shinrequested to merge
438388-only-retry-for-feature-specs into master

What does this MR do and why?

Only use rspec-retry for features (system) specs

Failing tests are quarantined in a separate commit: !145653 (ddf0326e)

In case we need to revert, let's not unquarantine those, keeping commits separately.

Related to #438388 (closed)

Edited by Lin Jen-Shin

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