[plugin model] use 'public' visibility for content modules which have plugin aliases (IJPL-207059)

Such modules can be referenced not by a 'dependencies.module' tag, but via a 'depends' or 'dependencies.plugin' tag with the plugin alias, so they should be public. 'jetbrains' namespace is used for them.

GitOrigin-RevId: f3d0601685fe1d312a2508be08e97f8d985e7133

RegExpSupport/resources/intellij.regexp.xml

@@ -1,4 +1,4 @@
-<idea-plugin>
+<idea-plugin visibility="public">
   <module value="com.intellij.modules.regexp"/>
 
   <extensionPoints>

plugins/IntelliLang/backend/resources/intellij.platform.langInjection.backend.xml

@@ -1,4 +1,4 @@
-<idea-plugin>
+<idea-plugin visibility="public">
   <module value="com.intellij.modules.langInjection.backend"/>
 
   <dependencies>

plugins/IntelliLang/resources/intellij.platform.langInjection.xml

@@ -1,4 +1,4 @@
-<idea-plugin>
+<idea-plugin visibility="public">
   <module value="org.intellij.intelliLang"/>
 
   <dependencies>

python/aliasProvider/resources/intellij.python.community.aliasProvider.xml

@@ -1,4 +1,4 @@
-<idea-plugin>
+<idea-plugin visibility="public">
   <dependencies>
     <module name="intellij.python.parser"/>
     <module name="intellij.python.ast"/>

python/pluginCore/resources/META-INF/plugin.xml

@@ -23,7 +23,7 @@ The Python plug-in provides smart editing for Python scripts. The feature set of
     <plugin id="com.intellij.modules.python-core-capable"/>
   </dependencies>
 
-  <content>
+  <content namespace="jetbrains">
     <module name="intellij.python.parser" loading="required"/>
     <module name="intellij.python.ast" loading="required"/>
     <module name="intellij.python.syntax.core" loading="required"/>