FileExtensionAttributeAdapter Fails jQuery Validation

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

When using the `FileExtensionAttribute` on an `IFormFile`, the `data-val-fileextensions-extensions` attribute is not constructed per jQuery documentation https://jqueryvalidation.org/extension-method/. The client-side validation always fails because each file extension is prefixed with a period.

https://github.com/dotnet/aspnetcore/blob/bce4dd5ff65a4d2089c3e20761ba34f3f403ef37/src/Mvc/Mvc.DataAnnotations/src/FileExtensionsAttributeAdapter.cs#L19-L26
https://github.com/dotnet/aspnetcore/blob/bce4dd5ff65a4d2089c3e20761ba34f3f403ef37/src/Mvc/Mvc.DataAnnotations/src/FileExtensionsAttributeAdapter.cs#L36

jQuery validation expects the file extensions to be given as comma or pipe-delimited without periods or spaces so they can be matched using RegEx.
https://github.com/jquery-validation/jquery-validation/blob/6cd68f68e395b1c3a2588e6e7d64f561410c2dc0/src/additional/extension.js#L2-L4

The normalized list of comma-delimited extensions should be used for the attribute instead of `_extensions`.
https://github.com/dotnet/aspnetcore/blob/bce4dd5ff65a4d2089c3e20761ba34f3f403ef37/src/Mvc/Mvc.DataAnnotations/src/FileExtensionsAttributeAdapter.cs#L23

### Expected Behavior

_No response_

### Steps To Reproduce

_No response_

### Exceptions (if any)

In jquery-validation 1.13.1 and older, this issue likely went mostly unnoticed due to a bug (This was fixed in jquery-validation 1.14.0)

### .NET Version

_No response_

### Anything else?

_No response_