chore: delete not-exposed test-retries implementation

[mxschmitt]

This was never public, we used retries on our internal tests only.

So lets either re-add it for only our internal tests only (because before it was half public half internal) or stick with NUnit defaults: e.g. https://docs.nunit.org/articles/nunit/writing-tests/attributes/retry.html.

[yury-s]

So lets either re-add it for only our internal tests only (because before it was half public half internal) or stick with NUnit defaults:

If you want to keep it then let's just change the implementation so that it's private?

[mxschmitt]

So lets either re-add it for only our internal tests only (because before it was half public half internal) or stick with NUnit defaults:

If you want to keep it then let's just change the implementation so that it's private?

I'd try to live without for now - maybe revisit it in the future.