Deprecate ApiFuzzingCiConfigurationCreate mutation

Paul Gascou-Vaillancourtrequested to merge
346366-deprecate-ApiFuzzingCiConfigurationCreate into master

This deprecates the ApiFuzzingCiConfigurationCreate mutation. It is not needed anymore because API Fuzzing configuration snippets are now generated client-side.

Changelog: deprecated
EE: true

Related to #346366 (closed)

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