Make add-on work w/o ddev-router, update tests

[stasadev]

The Issue

This add-on doesn't work in Gitpod.

How This PR Solves The Issue

In terms of functionality, this add-on is similar to https://github.com/ddev/ddev-phpmyadmin
This PR contains recent fixes and improvements from ddev-phpmyadmin.

Manual Testing Instructions

Test it locally and in Gitpod.

ddev get https://github.com/ddev/ddev-xhgui/tarball/20240718_stasadev_norouter
ddev restart
ddev xhgui

Automated Testing Overview

Related Issue Link(s)

Release/Deployment Notes

[rfay]

For more generality we may want to move to using the router on gitpod/codespaces.

[tyler36]

Hmmm ... not sure if If like the restart in the health checks. I know it removes duplication, but personally, I prefer it in the test body. That way:

• it reminds me I need to restart after the install,
• keeps the health checks clean; the check do just that, check, and
• it doesn't force a restart if I need to run health checks multiple times in the same test.

If you prefer it in the health check, I guess I'm OK with that.

[stasadev]

If you prefer it in the health check, I guess I'm OK with that.

It was a simple copy-paste to match the code in ddev-phpmyadmin.

I like your arguments, so I reverted this change.

[tyler36]

Works great! Thank you.

Test

1. Click "Open in GItpod" link in description.

2. Add PR via tarball.

   ddev get https://github.com/ddev/ddev-xhgui/tarball/20240718_stasadev_norouter

3. Restart DDEV to apply addon.

   ddev restart

4. Confirm site is working.

   ddev launch

5. Configure Drupal umami following instructions in this repo's README.

6. Start profiling.

   ddev xhprof

7. Navigate site to generate a couple of profile reports.

8. Confirm launch command opens xhgui.

   ddev xhgui