Python test runner: Add non-printing CI option (#33740)

* Python test runner: Add non-printing CI option

The CI files for the REPL tests are HUGE and they make it nearly
impossible to find the error you want. This PR adds a CI flag
where the output is only sent in case of a test failure.

* REPL tests: Add flag to tests

* add test failure

* Restyled by autopep8

* Revert "add test failure"

This reverts commit 9ee6a2e.

* change "ci" flag to "quiet"

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Co-authored-by: Restyled.io <commits@restyled.io>

Author: cecille