Copy old configs before testing

[samfreund]

Description

Presently, any tests using our old configs happen in place. This is problematic, as it changes the files themselves. This means that anyone running the tests will cause unintentional modifications, which stand a chance of being committed and merged into main. We want these old database files to remain untouched, thus we copy them to a temp directory prior to running our tests.

Meta

Merge checklist:

• Pull Request title is short, imperative summary of proposed changes
• The description documents the what and why, including events that led to this PR
• If this PR changes behavior or adds a feature, user documentation is updated
• If this PR touches photon-serde, all messages have been regenerated and hashes have not changed unexpectedly
• If this PR touches configuration, this is backwards compatible with all settings going back to the previous seasons's last release (seasons end after champs ends)
• If this PR touches pipeline settings or anything related to data exchange, the frontend typing is updated
• If this PR addresses a bug, a regression test for it is added