Fix: Focus on the first suggestion in MultiSelect filter (#16728)

[joaanyk]

Description

• Fixed the issue where the first visible option was not focused on filter input.
• Added functionality to select the focused option on pressing Enter.
• Improved keyboard navigation within the MultiSelect component.

Related Issue

Fixes #16728

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1 Skipped Deployment

| Name | Status | Preview | Updated (UTC) | | :--- | :----- | :------ | :------ | | **primeng** | ⬜️ Ignored ([Inspect](https://vercel.com/primetek/primeng/4nr9wNExdBVKkpNB3xdTxwNcFKiD)) | [Visit Preview](https://primeng-git-fork-mateuszstudentzero-fix-16728-clean-primetek.vercel.app) | Nov 21, 2024 8:19am |

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