Add more flaky files to exception list in CI

[tobiasdiez]

Add all flaky tests tracked at https://github.com/orgs/sagemath/projects/1 to the list in CI, so that those get automatically rerun in case of (random) failure.

📝 Checklist

• The title is concise and informative.
• The description explains in detail what this PR is about.
• I have linked a relevant issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation and checked the documentation preview.

⌛ Dependencies

[user202729]

this mechanism is too coarse-grained (it retries the whole set of files instead of just the one flaky test), but adding per-test flaky marker takes some work...

#39539

I don't like having two separate lists (one for the mapping, the other for the files) though. Ideas?

[user202729]

actually there's an "easy" solution for per-test flaky that doesn't sacrifice other tests in the same file: add # not tested (flaky) to each of these tests, then add a separate file that retries as needed.

As I mentioned, most of these tests only cause a Python-handle-able error on failure.