Fix test retry logic and code formatting

[sacOO7]

• Extracted test retry logic and formatting from https://github.com/ably/ably-dotnet/pulls
• Related to Fix flaky tests #1318

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/flaky-tests-with-formatter

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