Add periodic logging and graceful SoftTimeLimitExceeded handling for bot tasks

[maciejjanowski-tw]

This reverts commit feb952f.## Summary

• Adds periodic logging every 30 seconds in the click_captions_button wait loop to provide visibility when bots are waiting to be admitted to Google Meet
• Implements graceful handling for Celery SoftTimeLimitExceeded exceptions with proper event recording
• Makes the soft time limit configurable via environment variable (default: 4 hours)

Changes

Periodic Logging (google_meet_ui_methods.py)

• Added logging in the TimeoutException handler that fires every 30 iterations (~30 seconds)
• Log message includes: current attempt number, total attempts, elapsed time, and confirmation that denial/blocked patterns are being checked

SoftTimeLimitExceeded Handling

• settings/base.py: Added BOT_TASK_SOFT_TIME_LIMIT_SECONDS setting (default: 14400s / 4 hours)
• models.py: Added new FATAL_ERROR_SOFT_TIME_LIMIT_EXCEEDED event subtype (code: soft_time_limit_exceeded)
• run_bot_task.py:
  • Uses configurable soft_time_limit from settings
  • Catches SoftTimeLimitExceeded and creates a proper FATAL_ERROR event
  • Ensures cleanup runs before task exits

STAGED Bot Handling (bot_controller.py)

• Added interrupted_while_staged flag to track if bot was interrupted during STAGED state
• When interrupted in STAGED state, skips creating FATAL_ERROR event to allow task retry

Configuration

Set BOT_TASK_SOFT_TIME_LIMIT_SECONDS environment variable to override the default 4-hour limit.