Drop polyfills from GitLab UI
It seems like we are polyfilling UrlSearchParams. With our drop of IE11 we probably can remove it, unless another project depends on it.
TBH, we probably should not polyfill in GitLab UI itself, but rather document which features are needed so that consumers of GitLab UI can decide for themselves which browsers to support.
We also polyfill ResizeObserver, which we shouldn't, even though it isn't supported in Safari.
Edited by Lukas 'ai-pi' Eipert