- Bump xunit.runner.console to 2.9.0.
- Bump dotnet-stryker to 4.2.0.

- Fix the options from DI not being passed through to the strategy.
- Assert that the strategy isn't null when retrieved.

- Remove redundant branch because when the key is null it uses the default key, which is what `CurrentValue` does anyway.
- Assert that the correct options instance is retrieved.

Rename property to fix Name being overwritten.

- Start with the newest to see if that fixes Stryker.
- Explicitly target Debug for mutation tests.
- Add missing `eng` items to the Solution Items.

Enable dev mode for Stryker to try and work out why Polly.Specs mutation tests are failing.

Can only be enabled on the command-line, not in the configuration file.

Remove `true`.

Include logs from Stryker in the mutation reports.

It's a flag, not an option that you give a path...

See if stryker will work it out for itself.

Revert changes made to try and get Stryker working as it's been confirmed there's a bug.

Update xunit.runner.console to 2.9.1.