(kernelci/api/helper) Fix sanitizer and add test

[nuclearcat]

Since we have repeated mistake, we should add basic test case. Tests still need fixing, as some other of them are failing.

Fixes: kernelci/kernelci-pipeline#1157

[Copilot]

Pull Request Overview

Adds recursive sanitization of curly braces in node fields and a corresponding basic test to verify the behavior.

• Update _fsanitize_node_fields to walk through nested dicts and lists when escaping { and }
• Add tests/api/test_apihelper.py to validate that commit messages have their braces doubled

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/api/test_apihelper.py	New test to assert that _fsanitize_node_fields correctly escapes curly braces in nested nodes
kernelci/api/helper.py	Revamp of _fsanitize_node_fields to perform deep traversal on dicts and lists

Comments suppressed due to low confidence (4)

tests/api/test_apihelper.py:14

• [nitpick] The test function name test_apihelper is too generic. Consider renaming it to test_fsanitize_node_fields_curly_braces to clarify what behavior is being validated.

def test_apihelper():

kernelci/api/helper.py:393

• [nitpick] Docstring indentation is inconsistent and the second sentence is indented farther than the summary line. Align all docstring lines at the same indentation level and include a brief :returns: description.

Sanitize node fields to escape curly braces

tests/api/test_apihelper.py:11

• The test calls kernelci.config.load(...) but never imports kernelci.config. Add import kernelci.config (or from kernelci import config) at the top of the file so kernelci.config is defined.

import kernelci.api

kernelci/api/helper.py:401

• The recursive call self._fsanitize_node_fields(val, field_name) is invoked on every non-matching value, including primitives like strings and numbers. Restrict recursion to only dicts and lists to avoid needless calls on other types.

else: