fix(suspense): don't run post flush callbacks in suspended component (fix #6811) #7009
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As described in #6811 post flush watchers are executed in suspended components that are currently being switched out. This has huge implications for example in routing, where switching pages executes both post flush watchers both on the new page and also on the old page. This PR fixes this issue and causes post flush watchers to be executed ONLY on the new component.
Closes #6811