[dotnet] File structure: use language extension points instead of file type ones

Fixes file the new structure popup not working for non-default file types (fsx, fsi).
Fixes RIDER-103952, RIDER-124197

GitOrigin-RevId: 7de131487149ab2fc835fe2c3fd0779f691f1de2

Author: auduchinok

rider-fsharp/src/main/resources/META-INF/plugin.xml

@@ -47,10 +47,10 @@
     <programRunner order="first" implementation="com.jetbrains.rider.plugins.fsharp.services.fsi.runScript.FSharpScriptFsiRunner" />
     <projectModelViewExtensions implementation="com.jetbrains.rider.plugins.fsharp.projectView.FSharpProjectModelViewExtensions"/>
     <psi.referenceContributor language="F#" implementation="com.jetbrains.rider.ideaInterop.fileTypes.fsharp.psi.FSharpWebReferenceContributor" />
-    <rdclient.codeStructureTextAttributeProvider filetype="F#" implementationClass="com.jetbrains.rider.fileStructure.RiderTextAttributeProvider"/>
+    <rdclient.codeStructureTextAttributeProvider language="F#" implementationClass="com.jetbrains.rider.fileStructure.RiderTextAttributeProvider"/>
     <rider.ProjectTypesProvider implementation="com.jetbrains.rider.projectView.projectTypes.FSharpProjectTypeProvider" />
     <rider.debuggerSupportPolicy language="F#" implementationClass="com.jetbrains.rider.debugger.RiderDebuggerSupportPolicy" />
-    <rider.extendedCodeStructure filetype="F#" implementationClass="com.jetbrains.rider.plugins.fsharp.fileStructure.FSharpExtendedFileStructureSupport"/>
+    <rider.extendedCodeStructure language="F#" implementationClass="com.jetbrains.rider.plugins.fsharp.fileStructure.FSharpExtendedFileStructureSupport"/>
     <rider.run.dotNetProfileConsoleViewProvider implementation="com.jetbrains.rider.plugins.fsharp.services.fsi.runScript.FSharpScriptConsoleViewProvider"/>
     <runConfigurationProducer implementation="com.jetbrains.rider.plugins.fsharp.services.fsi.runScript.FSharpRunScriptConfigurationProducer"/>
     <runLineMarkerContributor language="F#" implementationClass="com.jetbrains.rider.plugins.fsharp.services.fsi.runScript.FSharpRunScriptMarkerContributor"/>