Remove the apiFuzzingCiConfigurationCreate GraphQL mutation

In !74783 (merged), we have marked apiFuzzingCiConfigurationCreate's fields as deprecated and we announced it in !75120 (merged).

In %15.0, we should remove the mutation altogether and announce it.

  • Removed apiFuzzingCiConfigurationCreate mutation.
  • Announced removal.

Related to #333233 (closed).

Edited by Paul Gascou-Vaillancourt