Show the Guacamole URL on the terminal after creating an SRE

[cptanalatriste]

✅ Checklist

• I have searched open and closed issues for duplicates.
• This is a request for a new feature in the Data Safe Haven or an upgrade to an existing feature.
• The feature is still missing in the latest version.
• I have read through the documentation.
• This isn't an open-ended question (open a discussion if it is).

🍓 Suggested change

When SRE creation finishes successfully, it would be nice to see the Guacamole URL printed on the terminal, to go ahead and check the SRD. Maybe it would also be good to see some "next steps" (i.e. user enrollment,...)

🚂 How could this be done?

Send the information to standard output, maybe?

[JimMadge]

The sre FQDN is an output of SRENetworkingComponent

data-safe-haven/data_safe_haven/infrastructure/programs/sre/networking.py

Line 1973 in 40089a6

self.sre_fqdn = sre_dns_zone.name

If we exported it from the Pulumi stack here

data-safe-haven/data_safe_haven/infrastructure/programs/declarative_sre.py

Lines 419 to 423 in 40089a6

	# Export values for later use
	pulumi.export("data", data.exports)
	pulumi.export("ldap", ldap_group_names)
	pulumi.export("remote_desktop", remote_desktop.exports)
	pulumi.export("workspaces", workspaces.exports)

I think we should be able to print it.