Cleanup medical history - use consistent naming

[MatMoore]

Description

Since we built the medical history forms in parallel, there's a bit of inconsistency between them. This PR aligns them to a common naming convention:

• Add/update forms are combined into one class, XYZHistoryItemForm
• Views are named AddXYZHistoryItemView / UpdateXYZHistoryItemView / DeleteXYZHistoryItemView
• The various models, forms, and views are grouped into subpackages

Jira link

https://nhsd-jira.digital.nhs.uk/browse/DTOSS-11781

Review notes

Review checklist

• Check database queries are correctly scoped to current_provider

[swebberuk]

Looks good to me. 👍

I did notice record_medical_history.jinja contains "Other breast or chest procedures" and "Non-cancerous lump diagnosis" - I'm not sure if they're required. We also have "Other procedure history" and "Benign lump history", which I think are the ones that are used.

[MatMoore]

Looks good to me. 👍

I did notice record_medical_history.jinja contains "Other breast or chest procedures" and "Non-cancerous lump diagnosis" - I'm not sure if they're required. We also have "Other procedure history" and "Benign lump history", which I think are the ones that are used.

Missed this comment earlier but I'll make sure to remove it in the next PR.