refactor(ui5-file-uploader): rename file size exceed event

[tsanislavgatev]

We are renaming the fileSizeExceeded event to file-size-exceed so it's consistent with the framework convention.

If you were using it as:

fileUploader.addEventListener("fileSizeExceeded", function (event) {
       alert("File is too big!");
}

You should now use it as:

fileUploader.addEventListener("file-size-exceed", function (event) {
       alert("File is too big!");
}