hardwared: handle failed thermal reads

[danielpolimac]

Summary

• report failed thermal-zone reads as NaN instead of crashing hardwared
• exclude non-finite sensor values when calculating control temperatures
• add regression coverage for valid reads, I/O failures, missing files, malformed values, discovery failures, and temperature aggregation

Fixes #36690

Test plan

• pytest -q openpilot/system/hardware/tests/test_hardwared.py (8 passed)
• ruff check openpilot/common/hardware/base.py openpilot/system/hardware/hardwared.py openpilot/system/hardware/tests/test_hardwared.py

[github-actions]

Process replay diff report

Replays driving segments through this PR and compares the behavior to master.
Please review any changes carefully to ensure they are expected.

✅ 0 changed, 66 passed, 0 errors