Improve logging: reduce noise, add labguide tracking, add session met…

[tatanithin]

…adata

Noise reduction (~94% fewer logs per session):

• Remove per-device status check logs (2400+/session)
• Remove 'Found N devices' poll cycle log
• Internal/client gRPC checks: log only state transitions
• CVP token error: downgrade to warning, suppress repeats
• Client gRPC test error: downgrade to warning (client firewall)
• CVP status down: log only transitions in atd-ws.js
• Add cvp_status_up event for CVP ready transition

Labguide page tracking (unified-header.js):

• Track every labguide page view via cloudLog
• Detect context: standalone, cvp, terminal, coder, browser, etc.
• Capture parent page path for iframe context
• Capture hash fragment as section label
• Filter Sphinx utility pages (genindex, search)
• Guard against double-fire from sub_filter_once off

Session metadata logging (session_logger.py):

• Log lab session details at uilanding startup
• Captures: lab_name, topology, course_name, lab_type, user_email, user_name, labguides_modules, login_user, eos_type, zone
• Handles missing customer_details gracefully

ClientLogHandler (pages.py):

• Extract page, context, parent_page, section labels from client logs