feat: add --no-shutdown flag to "hydra token user" to prevent auto-termination (#2382)

[verzac]

Related issue

#2382 @aeneasr

Proposed changes

Added --no-shutdown flag to hydra token user, which signifies that shutdown() should not be called. Also added the capability to regenerate state/nonce upon success/error - basically whenever /callback is called and whenever shutdown should've occurred if --no-shutdown was not provided.

Checklist

• I have read the contributing guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security. vulnerability, I
  confirm that I got green light (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further comments

Can't seem to figure out which docs I should change, as some of them are versioned and some of them aren't. Happy to update the docs if I'm pointed to the right direction!

This change regenerates state/nonce on error too, not just on success. Not sure if we're keen on this one, but I tried to keep the behaviour consistent with "we're terminating" -> "if --no-shutdown is provided, we're restarting the flow".

Also, added a nifty "Back to Welcome Page" button so that people can just click it to go back to the start of the flow.

RE: Tests, I don't think there's any that I should update? Feel free to CMIIW tho, I'm pretty new to the codebase :)

[CLAassistant]

All committers have signed the CLA.

[aeneasr]

Awesome, thank you! 🎉 Your contribution makes Ory better :)