[python] migrate junit5python tests to dev run

GitOrigin-RevId: c2b474f4fe944f6ed9c6729b730574f6dc56350d

platform/bootstrap/dev/src/org/jetbrains/intellij/build/devServer/JUnitDevMainKt.java

@@ -42,7 +42,8 @@ public final class JUnitDevMainKt {
     if (jUnitStarterModule != null) System.setProperty("idea.dev.build.test.additional.modules", jUnitStarterModule);
 
     String testEntryPointModulePlugin = System.getProperty("idea.dev.build.test.entry.point.module") + ".plugin";
-    System.setProperty("additional.modules", testEntryPointModulePlugin);
+    String additionalModules = System.getProperty("additional.modules");
+    System.setProperty("additional.modules", (additionalModules != null ? additionalModules + "," : "") + testEntryPointModulePlugin);
 
     // separate method to not retain local variables like implClass
     if (!build(lookup, classLoader)) {

platform/testFramework/junit5/eel/testResources/intellij.platform.testFramework.junit5.eel._test.xml

@@ -1,5 +1,6 @@
 <idea-plugin>
   <dependencies>
     <module name="intellij.libraries.junit5.pioneer"/>
+    <module name="intellij.platform.testFramework.junit5"/>
   </dependencies>
 </idea-plugin>

python/services/system-python/src/com/intellij/python/community/services/systemPython/api.kt

@@ -23,7 +23,7 @@ import org.jetbrains.annotations.CheckReturnValue
  * Service to register and obtain [SystemPython]s
  */
 @ApiStatus.NonExtendable
-sealed interface SystemPythonService {
+interface SystemPythonService {
   /**
    * The result of this function might be cached. Use [forceRefresh] to reload it forcibly.
    * @return system pythons installed on OS sorted by type, then by lang.level: in order from highest (hence, the first one is usually the best one)
@@ -91,7 +91,7 @@ class SystemPython internal constructor(private val delegate: VanillaPythonWithL
  * Tool to install python on OS.
  */
 @ApiStatus.NonExtendable
-sealed interface PythonInstallerService {
+interface PythonInstallerService {
 
   /**
    * Installs latest stable python on OS.