Misc fixes to the training scripts

[jessehouwing]

• Doesn't make repos private (cause private repos can't use Pages and Advanced Security and other potentially interesting repos)
• Increases wait times to prevent secondary rate limits
• Fixes python ssl error by downgrading urllib3 to v2.
• Removes github project creation, cause it's broken. Needs to be replaced with Projects V2 at some point.

• 394 Automatically imports bash env variables

• Changes ubuntu to jammy.

[amyschoen]

@jessehouwing, I merged my fix for #394 into this branch now that @parkerbxyz got me approved. I see that #390 looks like it fixes upgrading projects to v2. I hadn't considered the impact of making projects private on .com. We've been teaching on GHES historically, so Pages still work. I also like the idea of adding in Advanced Security as a part of the class. There are a lot of possibilities there.

[jessehouwing]

I hadn't considered the impact of making projects private on .com. We've been teaching on GHES historically, so Pages still work. I also like the idea of adding in Advanced Security as a part of the class. There are a lot of possibilities there.

@amyschoen We're teaching mostly through the GitHub Professional Services Partner Program and use the GitHub provided ps-developers-sandbox org to teach this class.

There is an admin class and a ghas class as well that already explains advanced security, but it's easier if the users are in a fully enabled public repo where a demo or answer to a question may lead to demoing these advanced features.

[jessehouwing]

Now that there is a gh cli extension to create and setup projects, it's probably a lot easier to use and maintain that. Which is true for many other elements of this class. It would do away with many a hairy API call and is probably more long-term compatible.