Hide event for model creation modal

What does this MR do and why?

Hide event for model creation modal

• This event guarantees a close and re-open when using events rather than v-modal in GlModal
• Gitlab-ui does not document this behavior https://gitlab-org.gitlab.io/gitlab-ui/?path=/docs/base-modal--docs

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

No change

How to set up and validate locally

Go to rails console using bin/rails c

Feature.enable(:model_registry)
project = Project.find(26)

Upload some files

• Go to the project URL in your browser
• Open the "Deploy" and "Model registry" under it.
• Use the "Create Modal" to show,
• Escape or click somewhere to hide

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