Move web_hook_test_api_endpoint_rate_limit FF to setting

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Proposal

This is related to &17281. As part of an Engineering-wide effort we want to clean up feature flags in areas where possible. Feature flags are not supported on Dedicated and therefore those features cannot be utilized by customers on the Dedicated platform.

Part of this is the web_hook_test_api_endpoint_rate_limit flag. Let's move the functionality that is behind this feature flag to a project level settings Settings > General