URLInput: check suggestions enabled before update

[mkaz]

Description

The URLInput has a diableSuggestions option, this changes prevents calling the function that checks for suggestions if it is disabled.

This prevents extra API calls and does not show the loader. Both of which should improve performance for entering URLs when suggestions are disabled.

Use case is in Social Links, see: #18946

How has this been tested?

1. Add Social Link
2. When typing URL, confirm loader does not show
3. Add another link, for example in a Paragraph block, confirm suggestions/loader does show.

Types of changes

Adds a check for disableSuggestions and if set, does not trigger the updateSuggestions

[mkaz]

Thinking about this more, I think it needs to be refactored. The showSuggestions is a trigger for the UI to show the suggestion box not if it should show them or not.

So my change solved for one case but broke it showing for when it should showSuggestions after not finding a suggestion, because the function that updates that setting won't get called.

[mkaz]

Fixed, switched to use this.props.disableSuggestions as the check. 👍