Quota: Fix eviction task flakes

This change disables eviction for tests that use
MockQuotaManagerProxy. Although not a direct fix for the
memory leak error[1] found in tests that use MockQuotaManagerProxy,
it should remove its flakiness behavior for tests that are
unrelated to the behavior of Quota eviction logic.
Similar error appear for NativeIoManagerTests.* [2]

[1] http://go/paste/5801296742318080
[2] https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=content_unittests%20(with%20patch)&tests=NativeIOManagerTest.*

Bug: 1242827
Change-Id: I1890b8df48455718a70a95e7b8c917903fa16a3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3116693
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Ayu Ishii <ayui@chromium.org>
Cr-Commit-Position: refs/heads/main@{#916887}