IJPL-172897 Rename EelDescriptor.{upgrade,toEelApi}

According to feedback, the name `upgrade` confuses people.

We refused `getEelApi` because this call usually implies a getter, and a getter usually implies some lightweight operation.

We refused `make`, `convert`, `get` and other short methods because they're as confusing as `upgrade`.

GitOrigin-RevId: 56adf5362f93bc4f98954db79c039e5e898b4550

python/services/internal-impl/src/com/intellij/python/community/services/internal/impl/PythonWithLanguageLevelImpl.kt

@@ -69,7 +69,7 @@ class PythonWithLanguageLevelImpl internal constructor(
   }
 
   override suspend fun getReadableName(): @Nls String {
-    val eelApi = pythonBinary.getEelDescriptor().upgrade()
+    val eelApi = pythonBinary.getEelDescriptor().toEelApi()
     val home = eelApi.userInfo.home.asNioPath()
     val separator = when (eelApi.platform) {
       is EelPlatform.Windows -> "\\"

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

@@ -15,6 +15,6 @@ internal class SystemPythonInitialLoader : ProjectActivity {
   override suspend fun execute(project: Project) {
     if (getCacheTimeout() == null) return // Cache is disabled, no need to preload it
     logger.debug("Preloading pythons for $project")
-    SystemPythonService().findSystemPythons(project.getEelDescriptor().upgrade())
+    SystemPythonService().findSystemPythons(project.getEelDescriptor().toEelApi())
   }
 }

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

@@ -53,7 +53,7 @@ internal class SystemPythonServiceImpl(scope: CoroutineScope) : SystemPythonServ
     scope.launch {
       _cacheImpl.complete(getCacheTimeout()?.let { interval ->
         Cache<EelDescriptor, SystemPython>(scope, interval) { eelDescriptor ->
-          searchPythonsPhysicallyNoCache(eelDescriptor.upgrade())
+          searchPythonsPhysicallyNoCache(eelDescriptor.toEelApi())
         }
       })
     }

python/services/system-python/tests/com/intellij/python/junit5Tests/env/systemPython/SystemPythonServiceShowCaseTest.kt

@@ -47,7 +47,7 @@ class SystemPythonServiceShowCaseTest {
   fun testListPythons(): Unit = timeoutRunBlocking(10.minutes) {
     for (systemPython in SystemPythonService().findSystemPythons(forceRefresh = true)) {
       fileLogger().info("Python found: $systemPython")
-      val eelApi = systemPython.pythonBinary.getEelDescriptor().upgrade()
+      val eelApi = systemPython.pythonBinary.getEelDescriptor().toEelApi()
       val process = eelApi.exec.spawnProcess(systemPython.pythonBinary.pathString, "--version").eelIt()
       val output = async {
         (if (systemPython.languageLevel.isPy3K) process.stdout else process.stderr).readWholeText()