* Show loading state while fetching data in a new model page (#46694)

* Show new model loading state while fetching

* Show new model loading state while fetching

* Add unit test

* Use `DelayedLoadingSpinner` instead

* Update the test

Co-authored-by: Kamil Mielnik <kamil@kamilmielnik.com>

* Prettier

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Co-authored-by: Kamil Mielnik <kamil@kamilmielnik.com>

* Fix the test

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Co-authored-by: Nemanja Glumac <31325167+nemanjaglumac@users.noreply.github.com>
Co-authored-by: Kamil Mielnik <kamil@kamilmielnik.com>