Removed PhotosAddOnly permission request within MediaPicker.ios

[Kyranio]

Description of Change

Removed permission request for adding photos to the devices library on iOS, inside MediaPicker.ios, which doesn't need this permission at this spot inside the code as it does not add the newly captured photo to the device's library here.

Given the official documentation, adding the picture to the device's library is an action given in the example after the CapturePhotoAsync is called, if the task's result contains a value.
This action is completely optional, the developer could implement different logic for handling the picture data after calling CapturePhotoAsync, meaning the permission request becomes unnecessary and redundant.

It is up to the developer to save the image to the device, which then requires the permission, meaning the developer should implement the permission request within their own logic.

Issues Fixed

Fixes #34246

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.sh | bash -s -- 34287

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.ps1) } 34287"

[dotnet-policy-service]

Hey there @@Kyranio! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[jfversluis]

It is up to the developer to save the image to the device, which then requires the permission, meaning the developer should implement the permission request within their own logic.

While that might be true, doesn't our implementation always save it to the gallery on iOS? We don't have an option to set the right now (see #30439), so because of that, we also need to have this permission now. If we make that optional for .NET 11, then we can make this permission optional as well