v3 Final Release Checklist

[jaredcnance]

• Improve deprecation error on SortQuery to identify what string should b used for the attr name
• Null reference exception if JsonApiContext is null during construction of BaseAttrQuery:
  

  JsonApiDotNetCore/src/JsonApiDotNetCore/Internal/Query/BaseAttrQuery.cs

  Line 44 in 89c38dc

  => _jsonApiContext.RequestEntity.Attributes.FirstOrDefault(attr => attr.Is(attribute));

 System.NullReferenceException : Object reference not set to an instance of an object.
Stack Trace:
   at JsonApiDotNetCore.Internal.Query.BaseAttrQuery.GetAttribute(String attribute) in C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Internal\Query\BaseAttrQuery.cs:line 44
   at JsonApiDotNetCore.Internal.Query.BaseAttrQuery..ctor(IJsonApiContext jsonApiContext, BaseQuery baseQuery) in C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Internal\Query\BaseAttrQuery.cs:line 29
   at JsonApiDotNetCore.Internal.Query.AttrSortQuery..ctor(IJsonApiContext jsonApiContext, SortQuery sortQuery) in C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Internal\Query\AttrSortQuery.cs:line 10
   at JsonApiDotNetCore.Extensions.IQueryableExtensions.Sort[TSource](IQueryable`1 source, IJsonApiContext jsonApiContext, SortQuery sortQuery) in C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Extensions\IQueryableExtensions.cs:line 62

...

This likely only occurs during tests where the context was not correctly mocked.

• Write final release notes
• Completed integration into canary production system