feat: Allow canceling container start in xUnit.net v3 fixtures#1431

HofmeisterAn merged 2 commits intotestcontainers:developtestcontainers/testcontainers-dotnet:developfrom

TheConstructor:feature/allow-cancel-start-of-fixtureTheConstructor/testcontainers-dotnet:feature/allow-cancel-start-of-fixtureCopy head branch name to clipboard