Use java.projects to scope source path actions

Author: MEHER SRUJANA MATCHA

package.json

@@ -1921,12 +1921,12 @@
           "group": "1_javaactions"
         },
         {
-          "when": "explorerResourceIsFolder&&javaLSReady",
+          "when": "explorerResourceIsFolder&&javaLSReady&&resourceDirname in java.projects",
           "command": "java.project.addToSourcePath.command",
           "group": "1_javaactions@1"
         },
         {
-          "when": "explorerResourceIsFolder&&javaLSReady",
+          "when": "explorerResourceIsFolder&&javaLSReady&&resourceDirname in java.projects",
           "command": "java.project.removeFromSourcePath.command",
           "group": "1_javaactions@2"
         }