properly counts op/a&e activity for HSA GAMs

[tomjemmett]

resolves #247 - outpatient and A&E gams are now using the correct sum of activity

resolves #221 - make sure we only generate GAMs where there is some data (there could be cases where a provider didn't have any activity at all for some of the hsagrps). also excludes paeds hospitals because they should never have gams generated (filter for age >= 18)

resolves #204 - allows us to generate gams for multiple years

[Copilot]

Pull request overview

Fixes incorrect activity aggregation when generating Health Status Adjustment (HSA) GAM inputs by using the appropriate “volume” fields for OP and A&E (instead of counting rows), aligning with issue #247.

Changes:

• Update OP aggregation to sum attendances (aliased to count) rather than row-counting.
• Update A&E aggregation to sum arrivals (aliased to count) rather than row-counting.
• Apply the same fix consistently across provider-, ICB-, and national-level GAM data generation.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/nhp/data/model_data/health_status_adjustment/generate_provider_gams.py	Uses sum(attendances) for OP and sum(arrivals) for A&E in the provider-level activity summary feeding GAMs.
src/nhp/data/model_data/health_status_adjustment/generate_national_gams.py	Uses correct OP/A&E volume summations in the national-level activity summary feeding GAMs.
src/nhp/data/model_data/health_status_adjustment/generate_icb_gams.py	Uses correct OP/A&E volume summations in the ICB-level activity summary feeding GAMs.

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[yiwen-h]

Of course - sorry I didn't spot this earlier!

I would also note in the PR title that this also makes the years for HSA GAMs variable rather than fixed to 202324 - I assume this is to accommodate other baseline years?