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/application/Parser/ScriptingDefinition/ScriptingDefinitionParser.spec.ts

@@ -21,7 +21,7 @@ describe('ScriptingDefinitionParser', () => {
       const expectedAssertion: ObjectAssertion<ScriptingDefinitionData> = {
         value: data,
         valueName: 'scripting definition',
-        allowedProperties: ['language', 'fileExtension', 'startCode', 'endCode'],
+        allowedProperties: ['language', 'startCode', 'endCode'],
       };
       const validatorStub = new TypeValidatorStub();
       const context = new TestContext()