Improve script/category name validation

- Use better error messages with more context.
- Unify their validation logic and share tests.
- Validate also type of the name.
- Refactor node (Script/Category) parser tests for easier future
  changes and cleaner test code (using `TestBuilder` to do dirty work in
  unified way).
- Add more tests. Custom `Error` properties are compared manually due to
  `chai` not supporting deep equality checks (chaijs/chai#1065,
  chaijs/chai#1405).

tests/unit/shared/Stubs/NodeDataErrorContextStub.ts

@@ -0,0 +1,12 @@
+import { NodeData } from '@/application/Parser/NodeValidation/NodeData';
+import { INodeDataErrorContext } from '@/application/Parser/NodeValidation/NodeDataError';
+import { NodeType } from '@/application/Parser/NodeValidation/NodeType';
+import { CategoryDataStub } from './CategoryDataStub';
+
+export class NodeDataErrorContextStub implements INodeDataErrorContext {
+  public readonly type: NodeType = NodeType.Script;
+
+  public readonly selfNode: NodeData = new CategoryDataStub();
+
+  public readonly parentNode?: NodeData;
+}