Fix separate compilation for ConstantsGen (#5630)

A combination of commands triggered separate compilation that only recompiled part of builtins. A mechanism that workaround annotation processor's problems with separate compilation was updated to include changes from #4111. This was pretty tough to find given the rather unusual circumstances in CI.

# Important Notes
This eliminates the _random_ failures in CI related to separate compilation.
To reproduce a specific set of steps has to be executed:
```
sbt> all buildEngineDistribution engine-runner/assembly runtime/Benchmark/compile language-server/Benchmark/compile searcher/Benchmark/compile
(exit sbt)
sbt> test
```

lib/scala/interpreter-dsl/src/main/java/org/enso/interpreter/dsl/TypeProcessor.java

@@ -115,19 +115,7 @@ protected void storeMetadata(Writer writer, Map<String, TypeMetadataEntry> pastE
         for (Map.Entry<String, BuiltinTypeConstr> entry : builtinTypes.get(f).entrySet()) {
           BuiltinTypeConstr constr = entry.getValue();
           if (!constr.getFullName().isEmpty()) {
-            out.println(
-                "  public static final String "
-                    + entry.getKey().toUpperCase()
-                    + " = \""
-                    + constr.getFullName()
-                    + "\";");
-
-            out.println(
-                    "  public static final String "
-                            + entry.getKey().toUpperCase() + "_BUILTIN"
-                            + " = "
-                            + toBuiltinName(constr.getFullName())
-                            + ";");
+            generateEntry(entry.getKey().toUpperCase(), constr.getFullName(), out);
           }
         }
       }
@@ -136,21 +124,29 @@ protected void storeMetadata(Writer writer, Map<String, TypeMetadataEntry> pastE
           .values()
           .forEach(
               entry ->
-                entry.stdlibName().ifPresent(n ->
-                        out.println(
-                        "    public static final String "
-                                + entry.ensoName().toUpperCase()
-                                + " = \""
-                                + n
-                                + "\";")
-                )
+                entry.stdlibName().ifPresent(n -> generateEntry(entry.ensoName().toUpperCase(), n, out))
           );
 
       out.println();
       out.println("}");
     }
   }
 
+  public void generateEntry(String name, String value, PrintWriter out) {
+    out.println(
+            "  public static final String "
+                    + name
+                    + " = \""
+                    + value
+                    + "\";");
+    out.println(
+            "  public static final String "
+                    + name + "_BUILTIN"
+                    + " = "
+                    + toBuiltinName(value)
+                    + ";");
+  }
+
   private String toBuiltinName(String name) {
     return "Constants.BUILTIN_NAMESPACE + \"." + name.substring(name.lastIndexOf('.') + 1) + "\"";
   }