Ben Loe

## What does this PR do? - Closes #3882 ## Checklist - [ ] Add tests - [ ] Designate a primary reviewer

Following up from #3810 Add storybook items for the components in the add block modal * Tag List * Search input with tags * Results grid item

A saved sidebar extension, when removed, still renders its panel when the pixiebrix sidebar is toggled off/on

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### Steps to reproduce: 1. create a sidebar extension 2. save it 3. render the panel 4. remove the extension from page editor 5. close and re-open the pixiebrix sidebar...

Page editor can sometimes enter a state where traces no longer work until the tab is reloaded

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* Ben has seen this happen, albeit very infrequently, only a handful of times total * Orlando reported the issue in Slack as well (8/24 in #extension-development) Can we figure...

Clean up the old code for the save-extension UX

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Related to #2557 There is now a lot of dead code in `SaveExtensionWizard` and `useSavingWizard`, since those will only ever be called for personal extensions, nothing with a recipe. We...

https://pixiebrix.slack.com/archives/C0436P48QHY/p1666388165242869

Demo: https://www.loom.com/share/ed62f14cc8cc4b609927039dd712041b

* They are strings right now * Was intended to match the formik status (string) * Storing the full errors gives us more info/context

* Split out the hook * Test the hook/modal