Refactored `CookieNames.cs` to replace the `GetEnvelopeReceiverCookieName(string key)` method with new methods for extracting envelope receiver keys from cookie names:
- Added `GetEnvelopeReceiverKeyOrDefault` to extract keys or return `null` if the format is invalid.
- Added `TryGetEnvelopeReceiverKey` to attempt key extraction with a success flag.
Updated `DigitalData.Auth.Claims.csproj` to increment `Version`, `AssemblyVersion`, and `FileVersion` from 1.0.0 to 1.0.1, reflecting the new functionality.
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