fix(mem): Stop leak from cacheTime outliving Query given WeakRef support (v3)

[klarstrup]

This change fixes the issue described in SSR: High memory consumption on server in environments with WeakRef support (most importantly Node 14.6+). I believe this will allow entire QueryClient instances to be garbage collected promptly now, even with cacheTimes much longer than the lifetime of the QueryClient instance.

I've included a couple of skipped tests that require being run with --expose-gc to reproduce the problem and confirm the fix, I didn't want to mess with y'all test setup but there they are.

Cheers
Io

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[TkDodo]

superseded by:

• feat(cacheTime): default cacheTime to Infinity for SSR #3377