[EuiMutationObserver] Migrate from class to function component

[weronikaolejniczak]

EuiMutationObserver wraps the browser MutationObserver API as a render-prop component. It extends EuiObserver.

• File: components/observer/mutation_observer/mutation_observer.tsx
• Class size: 18 lines
• State: None (stateless)
• Lifecycle: Inherited from EuiObserver

Migration notes:

Trivial migration once EuiObserver base is converted. Essentially just calls the observer setup with MutationObserver-specific config. Should be migrated together with EuiObserver.

Acceptance criteria:

• Convert to function component
• Maintain identical MutationObserver behavior
• All existing tests pass

[github-actions]

👋 Thank you for your suggestion or request! While the EUI team agrees that it's valid, it's unlikely that we will prioritize this issue on our roadmap. We'll leave the issue open if you or anyone else in the community wants to implement it by contributing to EUI. If not, this issue will auto close in one year.

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