test(fuzzer): add fuzzing tests for capec_map_enricher.py (fixes #2167)

[Adarshkumar0509]

Fixes #2167

Changes

• Rewrote tests/scripts/capec_map_enricher_fuzzer.py to follow the
  same pattern as the existing convert_fuzzer.py
• Added unittest.TestCase and assertLogs pattern matching convert_fuzzer.py
• Initialized enricher_vars with a valid args Namespace at module
  level to prevent crash in set_logging() before mocks apply
• Added per-argument fuzzing (version, edition, input_path, output_path,
  capec_json) as separate test cases
• Added Categories/Category fuzzing in fuzzed JSON data
• Fixed install_cornucopia_deps.txt: updated pathspec from 0.12.1 to
  1.0.0 with correct hash to resolve dependency conflict with mypy

Testing

• Build verified with oss-fuzz ClusterFuzzLite locally
• check_build passed: INFO:__main__:Check build passed.

AI Tool Disclosure

• My contribution does not include any AI-generated content

Affirmation

• My code follows the CONTRIBUTING.md guidelines

[Adarshkumar0509]

hii @sydseter sir , The ClusterFuzzLite failures are caused by a pre existing conflict in upstream master's install_cornucopia_deps.txt: pathspec==0.12.1 conflicts with mypy==1.20.0 which requires pathspec>=1.0.0. Should I open a separate PR to fix this dependency conflict, or will it be handled separately?

[sydseter]

@Adarshkumar0509 We should look at that separately. If you want to, you are welcome to have a go at it. I‘ll merge this. Your improving test coverage is good enough.

[Adarshkumar0509]

Thank you @sydseter yeah that make sense I would be happy to open a separate PR to fix the pathspec dependency conflict. I will work on that next.