These methods don't need to be overriden, as they are not excepted to be used in collections.
Also improve the toString method of this class, which contains also now clearFactor and maximumSize attributes and for each operations.
The test added in YoutubeDashManifestCreator uses a video of the Creative Commons channel, licenced under the Creative Commons Attribution licence (reuse allowed).
Also remove public keywords of tests in UtilsTest, as suggested by SonarLint, because they are not needed with Junit 5.
When using the index here, it the index needs to be decremented once an element is removed. To cirecumvent this, the native Collections.removeIf() method is used.