feat: remove certain cookies from responses

[rgraber]

Description:

Updates CookieMonitoringMiddleware to remove certain cookies (specified in a setting) from responses. Removes them by setting an expiration date in the past.

Issue: https://github.com/edx/edx-arch-experiments/issues/297

Testing instructions: Tested by removing the experiments_is_enterprise cookie from CMS (it's set in LMS)

Reviewers:

• [ ] tag reviewer

Merge checklist:

• [ ] All reviewers approved
• [ ] CI build is green
• [ ] Version bumped
• [ ] Changelog record added
• [ ] Documentation updated (not only docstrings)
• [ ] Commits are squashed

Post merge:

• [ ] Create a tag
• [ ] Check new version is pushed to PyPi after tag-triggered build is finished.
• [ ] Delete working branch (if not needed anymore)

Author concerns:

List any concerns about this PR - inelegant solutions, hacks, quick-and-dirty implementations, concerns about migrations, etc.