feat: show out of office replacement

[hamza221]

☑️ Resolves

• Part of 📅⛔ Allow users to select another user as their out-of-office replacement server#40398
• requires Feat: Allow users to select another user as their out-of-office replacement server#45766

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

🏚️ Before	🏡 After

🚧 Tasks

• ...

🏁 Checklist

• 🌏 Tested with Chrome, Firefox and Safari or should not be risky to browser differences
• 🖥️ Tested with Desktop client or should not be risky for it
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required

[Antreesy]

Changes looks good! Let's wait for server PR to be merged, then we'll test it again
When possible, please provide a screenshot, if design team would like to check it out

[DorraJaouad]

LGTM code-wise. However, the UI doesn't look much accessible cc @nextcloud/designers

[nickvergessen]

@DorraJaouad @Antreesy please review

[DorraJaouad]

Tested, thanks!