Fix two types of eviction hangs

[ericl]

What do these changes do?

While writing tests for memory limits I ran into these unhandled eviction hangs. This PR fixes them and add tests for them.

Related issue number

I don't think these have an issue associated.

Linter

• I've run scripts/format.sh to lint the changes in this PR.

[stephanie-wang]

You'll have to modify the .cc test, too. Usually, I run something like this to check the tests:

bazel test --test_output=errors //:reconstruction_policy_test

[stephanie-wang]

Does it make sense to put these in a new file? Maybe they should go in test_failure.py instead.

[ericl]

Isn't that test file too large already?

[stephanie-wang]

Hmm I'd prefer we just put it there now and reorganize that whole file later, but up to you.

[ericl]

Oops, fixed the test.

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