Silence false-positive session matching warnings

[cbueth]

In add_recorded_sessions (within multipleye_data_collection.py), folders that do not match the expected session regex pattern currently trigger a warning print statement. This leads to noise for standard project folders like test_sessions, core_sessions, and pilot_sessions.

• Add a new constant IGNORED_SESSION_FOLDERS = ["test_sessions", "core_sessions", "pilot_sessions"] to preprocessing/constants.py.
• Update the else block (lines 280-284) in add_recorded_sessions to only log a warning if the folder name is not in IGNORED_SESSION_FOLDERS.

[cbueth]

Implemented in e448511