fix: Action dropdown not properly overflowing

[tiagoapolo]

Thanks for submitting a PR! Please check the boxes below:

• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

ref: #4981
Because virtualized lists require an overflow, it requires a react portal to render the dropdown outside of the overflow context.

Single user

[multiple users] user positioned in the middle of the scrollable container

[multiple users] user positioned in the bottom of the scrollable container

How did you test this code?

1. go to /organisation/<ORG_ID>/permissions
2. Make sure you have a members list with 100+ users
3. click on 3 dots to see actions

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[github-actions]

Docker builds report

Image	Build Status	Security report
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ghcr.io/flagsmith/flagsmith-frontend:pr-5000	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-59918 was deleted.

[kyle-ssg]

Great stuff