Implement Console Do Not Track

[allo-]

comfy-cli implements tracking via Mixpanel, that seems to be enabled and disabled only by a config value of comfy-cli itself:

comfy-cli/comfy_cli/tracking.py

Line 50 in 176d2de

enable_tracking = config_manager.get(constants.CONFIG_KEY_ENABLE_TRACKING)

It would be good, if it could also respect the Console Do Not Track standard described here: https://consoledonottrack.com

Describe the solution you'd like
comfy-cli should read the DO_NOT_TRACK environment variable and disable tracking if it has a truthy value.

Here is an example implementation:
https://github.com/huggingface/huggingface_hub/blob/f77c1c9f90b462727c581fec349e6c781c886265/src/huggingface_hub/constants.py#L121

Describe alternatives you've considered
Tracking could be opt-in.

Additional context
A lot of other console tools already use the unified DO_NOT_TRACK environment variable, helping users to make sure not to forget an opt-out if they dislike telemetry.