Merge v4.2.1 changes into develop

[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.
• Your branch is up-to-date with the target branch (it probably was when you started, but it may have changed since then).

🚦 Depends on

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⤴️ Summary

Merge v4.2.1 changes into develop

🌂 Related issues

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🔬 Tests

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[jemrobinson]

Superseded by #1924

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
data_safe_haven/commands
config.py					99-103
data_safe_haven/config
config_sections.py
shm_config.py					30
sre_config.py					51-53, 55-57, 59-61, 63-65, 67-69
data_safe_haven/external/api
azure_sdk.py					122-128, 130-131, 157, 177-190, 192-193, 862-868, 984, 995, 1331
credentials.py					211-214
data_safe_haven/external/interface
azure_postgresql_database.py					145-146
data_safe_haven/infrastructure
project_manager.py					82, 277
data_safe_haven/infrastructure/programs/sre
data.py					84-85
gitea_server.py					339, 353
hedgedoc_server.py					318, 332
user_services.py					97, 122
workspaces.py					59-60
data_safe_haven/logging
logger.py
plain_file_handler.py
data_safe_haven/serialisers
yaml_serialisable_model.py
data_safe_haven/types
annotated_types.py
Project Total

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