Luke Gmys

[Security Solution Platform] Allow customizable plugin page layout #4666

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## Summary Changes in this PR will allow each plugin route to customize `template` mode used to render the contents. Please see https://github.com/elastic/security-team/issues/4666 for reference. ### Checklist Delete any items...

WIP [TIP] Loading state changes and react-query integration

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## Summary Summarize your PR. If it involves visual changes include a screenshot or gif. ### Checklist Delete any items that are not applicable to this PR. - [ ]...