Move peer eviction tests to a separate test file

Summary:
out of net_tests, because the eviction tests:

• are a different domain of test coverage, with different dependencies

• run more slowly than the net tests

• will be growing in size, in this PR branch and in the future, as eviction test coverage is improved

This is a backport of core#20197 [2/6]
https://github.com/bitcoin/bitcoin/pull/20197/commits/41f84d5eccd4c2620bf6fee616f2f8f717dbd6f6

Depends on D10975

Test Plan: ninja check

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10976