As the comments say, these are not real teams. There is a ( export ) command, but it is a command shell ( bash in your case, although there are other shells), not a git command. It modifies the set of environment variables that the shell provides to other commands.
So, you just need to undo what you did in bash with another bash command.
You can use the SirBraneDamuj method :
export GIT_TRACE_PACKET=0 GIT_TRACE=0
This saves these variables in the environment, but changes their meaning. Or you can:
unset GIT_TRACE_PACKET GIT_TRACE
which completely removes these two names from the set of environment variables. The effect on git will be the same. (For some other commands and some other variables, sometimes there is a difference between "set to 0 or empty-string" vs "not set at all", so you should remember both methods.)
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