Better logging during SRE provisioning

[jemrobinson]

✅ Checklist

• You have given your pull request a meaningful title (e.g. Enable foobar integration rather than 515 foobar).
• You are targeting the appropriate branch. If you're not certain which one this is, it should be develop.
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🚦 Depends on

n/a

⤴️ Summary

Log which workspaces are registered during SRE provisioning

🌂 Related issues

n/a

🔬 Tests

Logging only

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
data_safe_haven/external/interface
azure_postgresql_database.py					149, 190, 218
data_safe_haven/provisioning
sre_provisioning_manager.py					117
Project Total

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