Align API Fuzzing frontend with backend

What does this MR do?

This updates the API fuzzing configuration form's frontend implementation to match backend decisions that have been implemented in !53883 (merged). Specifically:

• The CreateApiFuzzingCiConfigurationInput type was renamed to ApiFuzzingCiConfigurationCreateInput.
• The createApiFuzzingCiConfiguration mutation was renamed to apiFuzzingCiConfigurationCreate.
• The gitlabCiYamlEditUrl field was renamed to gitlabCiYamlEditPath.

How to test this?

1. Enable the :api_fuzzing_configuration_ui feature flag:

echo "Feature.enable(:api_fuzzing_configuration_ui)" | rails c

2. Browse to the API fuzzing configuration form at /:namespace/:project/-/security/configuration/api_fuzzing

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry featureflagdisabled
• [-] Documentation (if required)
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Related to #322621 (closed)