feat(config): add environment variable support for all taskrc options #2607
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Summary
Add environment variable support for all taskrc configuration options. Allow users to configure Task via
TASK_*environment variables (e.g.,TASK_VERBOSE,TASK_COLOR,TASK_CONCURRENCY) with priority: CLI flags > env vars > taskrc config > defaults.GetTaskEnvBool,GetTaskEnvInt,GetTaskEnvDuration,GetTaskEnvString,GetTaskEnvStringSlice) ininternal/envgetConfigto check env vars before falling back to taskrcVERBOSE,COLOR,CONCURRENCY,FAILFAST,DISABLE_FUZZY,REMOTE_*(insecure, offline, timeout, cache-expiry, cache-dir, trusted-hosts)