Fix issue in finding navigation target for type segment present in OData path

[gathogojr]

Issues

This pull request fixes #2689.

Description

When the OData path ends with a type segment and the $expand expression starts with a non-contained navigation property, the ExpandedNavigationSelectItem item in the SelectExpandClause has Microsoft.OData.UnknownEntitySet as the navigation source.

Detailed description of the issue can be found here #2689.

Be noted: A minor consequence of this change is that by making the additional call to IEdmNavigationSource.FindNavigationTarget(IEdmNavigationProperty) in the attempt to resolve the navigation target, that method returns a Microsoft.OData.Edm.EdmUnknownEntitySet if it fails to find the navigation target, as opposed to Microsoft.OData.UnknownEntitySet returned from EdmExtensionMethods.FindNavigationTarget(IEdmNavigationSource, IEdmNavigationProperty, Func) before.
However, both methods return an Microsoft.OData.Edm.IEdmNavigationSource.
In addition, both Microsoft.OData.Edm.EdmUnknownEntitySet and Microsoft.OData.UnknownEntitySet derive from Microsoft.OData.Edm.IEdmUnknownEntitySet.
A significant number of tests hit that statement and none broke after the change.

Checklist (Uncheck if it is not completed)

• Test cases added
• Build and test with one-click build and test script passed

Additional work necessary

If documentation update is needed, please add "Docs Needed" label to the issue and provide details about the required document change in the issue.

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Total files changed: 2

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