feat: use type=module in nightwatch projects

[cexbrayat]

nightwatch v3.3.4 fixed nightwatchjs/nightwatch#3959

I removed the custom assertions and commands, as they don't work out-of-the-box, they are not used in the generated tests, and they bring little value compared to the official nightwatch documentation

[garg3133]

@cexbrayat Just curious what you mean by "they don't work out-of-the-box".

[cexbrayat]

The JS version needs to use CJS files whereas the TS version needs to use TS files, and for whatever reason, it failed in some combinations of the generated projects (typescript-jsx-nightwatch if I remember correctly). As the custom assertions are not used in the generated tests, I preferred removing them instead of figuring out what we should do to make every combination work. I think people interested in Nightwatch won't have any trouble figuring out how to add custom assertions and commands if they need them.