[SIEM] Fix Edit Filter suggestions displayed behind Filter Popover

[patrykkopycinski]

Summary

Fixes #52329

styled-components bump changed the way how global styles are propagated, so to keep the previous behavior I've moved some styles overrides to the AppGlobalStyle

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Checklist

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• This was checked for cross-browser compatibility, including a check against IE11
• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
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[elasticmachine]

Pinging @elastic/siem (Team:SIEM)

[elasticmachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 5041c5b

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[spong]

Thanks for keeping these comments around -- will be beneficial to our future selves! 🙂

[spong]

Checked out locally, verified fix on the SIEM Global Filter, Timeline Filter, and Signals Create Rule Filter, and performed code review.

Loooooks good to me! Thanks for the quick-fix @patrykkopycinski 👍 🚀

Note: The field selection list flashing at 0,0 when first clicking the filter is a pre-existing issue. See #49962 for details.

[patrykkopycinski]

@spong Thank you for the review 💪

I've checked the issue you mentioned, it seems the focus is triggered before the animation is finished. Here is a PR that, in my opinion, should fix that elastic/eui#2614