Use `GlTable` for the deployment approval settings in the add rule modal

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What does this MR do and why?

Use GlTable for the deployment approval settings in the add rule modal.

Closes: #480878 (closed)

EE: true

Changelog: changed

Screenshots or screen recordings

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How to set up and validate locally

1. Run GDK.
2. Create a project with an environment and deployments.
3. Navigate to <project> > Settings > CI/CD > expand a Protected environments.
4. Press Add approval rules button to open the modal.