Run installed Galaxy with no config and a simplified entry point

[natefoo]

Building off #17102, make it possible to start and run a simple Galaxy web server using a single command when running from installed packages and the prebuilt client. Also delays conda auto-init util the first time an install is attempted. disables conda auto-init when running installed.

How to test the changes?

(Select all options that apply)

• Instructions for manual testing are as follows:

  python -m venv /tmp/galaxy/venv
  . /tmp/galaxy/venv/bin/activate
  cd packages
  ./package-dev-install.sh web_apps
  cd /tmp/galaxy
  npm install @galaxyproject/galaxy-client
  galaxy-web

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[natefoo]

This is ready for review

[jdavcs]

Looks good. Although I didn't test the install locally.

[nsoranzo]

I think we should remove the default from the line above like we do for managed_config_dir and data_dir.

[nsoranzo]

Suggested change

	if not running_from_source and kwargs.get("conda_auto_init") is None:
	self.config_dict["conda_auto_init"] = False
	if kwargs.get("conda_auto_init") is None:
	self.config_dict["conda_auto_init"] = running_from_source