📖 Update roadmap_2024.md - Complete goal to align webhook scaffold with the latest changes in controller-runtime

[camilamacedo86]

The current scaffold is using the new interfaces and no longer the methods which are not supported.

See that the changes were done in the following PRs:

• (go/v4): Replaced the deprecated webhook.Validator and webhook.Defaulter interfaces with CustomValidator and CustomDefaulter. Projects using the old interfaces must migrate to ensure compatibility with future versions. (⚠️ : (go/v4): Replace usage of deprecated webhook.Validator and webhook.Defaulter interfaces #4060)
• (go/v4): Webhooks are now decoupled from the API directory. Webhook files should be moved from api/ or api// to internal/webhook/ or internal/webhook//. This restructuring improves project organization. (⚠️ (go/v4) decouple webhooks from APIs (Move Webhooks from api/<version> or api/<group>/<version> to internal/webhook/<version> or internal/webhook/<group>/<version>) #4150)

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