Enable the FF ci_raw_variables_in_yaml_config by default

What does this MR do and why?

This MR enables the feature flag ci_raw_variables_in_yaml_config by default.

It has been enabled on SaaS since 2022/11/16.

• Rollout issue: #375034 (closed)
• Feature issue: #353991 (closed)
• Introduced in: !98420 (merged)

MR acceptance checklist

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