RIDER-133794 [rider-tests]: Improve modules structure in Rider JUnit tests

* Create `framework-junit` from old `framework-junit` and `framework-junit5`
* Create `framework-unit` from unit tests parts of old `framework-junit`
* Rename `cases-junit` to `cases-unit`

GitOrigin-RevId: 3d6a924e9cc25e37a93b82156d9f3b4ccb9e0e62

Author: Konstantin343

rider-fsharp/src/test/resources/intellij.rider.plugins.fsharp.test.cases.xml

@@ -6,6 +6,7 @@
         <module name="intellij.rider.test.framework.integration.testng._test"/>
         <module name="intellij.rider.test.framework.core"/>
         <module name="intellij.rider.test.framework.testng"/>
+        <module name="intellij.rider.test.framework.unit"/>
         <module name="intellij.rider.test.framework.junit"/>
     </dependencies>
 </idea-plugin>