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Take disk requests into account during evictions

fixes #54314

This PR is part of the local storage feature, and it makes the eviction manager take disk requests into account during disk evictions.
This uses the same eviction strategy as we do for memory.
Disk requests are only considered when the LocalStorageCapacityIsolation feature gate is enabled.  This is enforced by adding a check for the feature gate in getRequests().
I have added unit testing to ensure that previous behavior is preserved when the feature gate is disabled.
Most of the changes are testing.  Reviewers should focus on changes in **eviction/helpers.go**

/sig node
/assign @jingxu97  @vishh