Reset thresholds when calling clear

[btjanaka]

Description

We encountered a bug where after calling clear(), adding to the archive did not result in the correct statuses and values. This happens because we did not reset the thresholds when calling clear(), and since archive addition is based on crossing the thresholds, nothing was being added to the archive. This PR clears the thresholds to resolve this bug.

TODO

Questions

Status

• [x] I have read the guidelines in CONTRIBUTING.md
• [x] I have formatted my code using yapf
• [x] I have tested my code by running pytest
• [x] I have linted my code with pylint
• [x] I have added a one-line description of my change to the changelog in HISTORY.md
• [x] This PR is ready to go