2025-07-22 Babeltrace 2.1.2 (National Hammock Day)

• src.ctf.fs: be less strict when encountering trailing byte at the end of packetized CTF 1.8 metadata
• tests: add bt_test_cli
• tests: make bt_cli accept non-positional options
• tests: bt_diff_cli: don't pass unexpected extra args to bt_diff
• tests: remove unnecessary nonlocal keywords
• Fix: Python: set local typing version to that of 3.5.2
• Fix: Python: missing contains method for _PluginComponentClasses
• Fix: tests: Add explicit items method for Mapping compatibility
• Tests: sync normand.py with upstream
• Fix: tests: Add explicit iter method for Iterator compatibility
• Fix: Use local_typing with Python < 3.5.3
• Update working version to Babeltrace v2.1.2