* fix(telemetry): accept 1/yes/on on disable flags
CREWAI_DISABLE_TELEMETRY=1 was ignored because the gate only matched true, so telemetry stayed on with no warning.
* fix(telemetry): warn once on unrecognized disable values
Stop repeating the same invalid-flag warning on every telemetry check, and drop the undocumented CREWAI_DISABLE_TRACKING alias from docs.
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Co-authored-by: Lorenze Jay <63378463+lorenzejay@users.noreply.github.com>