chore: release plans flow in flag environments

[nunogois]

https://linear.app/unleash/issue/2-2816/add-release-plan-to-feature-flag-from-release-template https://linear.app/unleash/issue/2-2818/list-release-plan-with-milestones-in-feature-flag-environment-section https://linear.app/unleash/issue/2-2819/removing-release-plan-from-feature

Implements the release plan flow in the feature flag environment.

You can now manage release plans in a feature flag environment by adding or removing them, as well as start milestones.

https://github.com/user-attachments/assets/24db9db4-7c3a-463e-b48a-611358f2b212

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Name	Status	Preview	Comments	Updated (UTC)
unleash-monorepo-frontend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 26, 2024 8:59am

1 Skipped Deployment

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **unleash-docs** | ⬜️ Ignored ([Inspect](https://vercel.com/unleash-team/unleash-docs/PWedXCxWg4uEQW5d2py4fvARNa97)) | [Visit Preview](https://unleash-docs-git-chore-release-plans-shown-a08060-unleash-team.vercel.app) | | Nov 26, 2024 8:59am |

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