Added API analyzer functionality for conditional return expressions

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Description

The analyzer API1000 and API1001 are not creating warning when returning with a conditional statement. In this PR I added the functionality that conditional statements are evaluated as well.

In order to do this, I had to change the InspectReturnOperation method to return multiple ActualApiResponseMetadata instead of a single one. A single IReturnOperation can have a IConditionalOperation which has two children WhenTrue and WhenFalse.

This leads to the fact that a single conditional statement can return two ActualApiResponseMetadata instances and if there are more conditional statements nested, it will return even more instances from one IReturnOperation.

Fixes #33105