Add schema validation for collection files #369

This commit improves collection file editing and error detection
directly in the IDE. It adds YAML schema, IDE configuration and
automatic tests to validate it.

- Introduce a YAML schema for collection file.
- Use `yaml-language-server` for enhanced YAML support in VSCode.
- Add telemetry disabling in `configure_vscode.py` to respect user
  privacy.
- Add automated checks to validate YAML file structure against the
  schema.
- Remove unused properties and do not allow them in compiler.

tests/unit/shared/Stubs/CollectionDataStub.ts

@@ -47,7 +47,6 @@ export function getCategoryStub(scriptPrefix = 'testScript'): CategoryData {
 
 function getTestDefinitionStub(): ScriptingDefinitionData {
   return {
-    fileExtension: '.bat',
     language: ScriptingLanguage[ScriptingLanguage.batchfile],
     startCode: 'start',
     endCode: 'end',