[ic-search-bar] props not working as expected

[GCHQ-Developer-530]

Summary of the bug

When checking search bar against the PR checklist, I noticed that spell check and auto focus didn't work as expected.

🪜 How to reproduce

Tell us the steps to reproduce the problem:

1. On the search bar playground turn on spellcheck
2. Try typing something wrong - see that there are no red lines
3. Turn on autofocus
4. See that focus isn't given to the component

📸 Screenshots or code

Example of the html input with spell check

Search bar with spell check

🧐 Expected behaviour

The props should work where red lines appear for spell check and the component is focused on page load for autofocus.

Additional info

We have a focusOnLoad prop that works correctly and focuses the component on load, but autofocus doesn't work (do we just need to do the same thing for both of these props?)

[MI6-255]

Is spell check on Text field working too?

[MI6-255]

Is this a quirk of Storybook or the specific browser, explore if this is the case in this ticket. Instead, check this behaviour on a form

[MI6-255]

Works in stackblitz, not in Storybook

[MI6-255]

We've got a Cypress test for spellcheck, but not autofocus