LinkControl - ensure minmum loading UI display when Creating a new suggestion via createSuggestion

[getdave]

A delay of 0.2–1.0 seconds does mean that users notice the delay and thus feel the computer is "working" on the command, as opposed to having the command be a direct effect of the users' actions.

https://www.nngroup.com/articles/response-times-3-important-limits/

Currently when clicking "Create" if the createSuggestion promise resolves quickly then the UI state for "loading" only displays very briefly. This can be jarring (as per @karmatosed's comment below).

To avoid this we should enforce a minimum delay on the "Creation" of between 500 - 1000ms to the ensure the user can perceive the editor is doing "work".

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Originally posted by @karmatosed in #19775 (comment)

The 'creating page' flashed a little too short. I wonder if we either shouldn't see it or should and then carry on. Seeing a flash was a little weird for an experience.

[jasmussen]

I'm not able to reproduce this issue anymore. Is it still relevant?

[jasmussen]

I'm closing this one as the UI has changed so much since then. We can always revisit.