Expose shell's environment - zsh

[anthonykim1]

Trying to break #228791 down smaller so that it is easier to review.

Part of #227467

[anthonykim1]

Going through more rigorous testing, I realized sometimes (although very not expected), things like -q show up as an environment variable's value. This of course throws error. I've aimed to better handle it now, soo it skips that variable entirely.

Also since hypens shouldn't really be part of variable name, we would skip the 'sending' of the variable if we detect usage of - in an environment variable name.

[Tyriar]

@anthonykim1 could you test performance with and without this to see what sort of overhead it adds?

[anthonykim1]

@Tyriar It might be better if I do it in #238488 first with bash since I've already got started with it. I think I narrowed it down so it is as instant as before. Will still do the timing test to see how much time it is adding too!

Will move this to draft until I resolve bash perf, and also fix zsh perf (they pretty much share perf-issue logic so higher probability that some changes are needed here on zsh script as well)