browser: fix file uploads with '#' in the name (#11261)

When the file name or the prefix contains `#`,
whatever comes after is ingored.

This is fixed by encoding the object path using
encodeURIComponent.

Fixes #11112

browser/app/js/uploads/actions.js

@@ -94,7 +94,7 @@ export const uploadFile = file => {
       _filePath = _filePath.substring(1)
     }
     const filePath = _filePath
-    const objectName = `${currentPrefix}${filePath}`
+    const objectName = encodeURIComponent(`${currentPrefix}${filePath}`)
     const uploadUrl = `${
       window.location.origin
     }${minioBrowserPrefix}/upload/${currentBucket}/${objectName}`