Address warnings present in test suite

[fselmo]

We are getting a lot of warnings in our test suite related to:

  /Users/...../.pyenv/versions/3.12.3/lib/python3.12/copy.py:151: DeprecationWarning: Pickle, copy, and deepcopy support will be removed from itertools in Python 3.14.

We should silence these and see if there are any other warnings coming through that need silencing.

[fselmo]

#3513 addresses the main case of this. The PersistentConnectionProvider request information cache also copies the counter. This may be more difficult to tackle.