Improve performance of PC2-TestData.sql

[Copilot]

SQL test data load was slow (30s+) due to per-row commits, repeated parse/compile cycles, and individual INSERT round-trips.

Changes

• Single transaction: Wrapped all inserts in BEGIN TRANSACTION / COMMIT TRANSACTION — eliminates per-row auto-commit
• Removed 2,751 GO statements: One GO per row meant SQL Server was parsing/compiling each insert as a separate batch
• Multi-row VALUES batches: Grouped up to 100 rows per INSERT — reduces round-trips and transaction log writes

Table	Rows	INSERT statements (before → after)
Agency	900	900 → 9
AgencyAgencyCategory	1,758	1,758 → 18
AgencyCategory	72	72 → 1
CalendarEvents	3	3 → 1
People	11	11 → 1

File shrunk from 5,506 lines to 2,825 lines. All data values are preserved exactly.

Copilot Summary

Automated refactor — no logic changes, data-only.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Request] - Improve performance of PC2-TestData.sql</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.
On some lower spec hardware, the test data script can take 30 seconds or more to run. While this may not be big deal if it only needs to be run one time, it is still frustrating.

Describe the solution you'd like
Refactor the sql to improve performance

Describe alternatives you've considered
N/A

Additional context
Possible performance improvements?
Single transaction - Eliminates per-row auto-commit
Remove GO per row - Eliminates per-batch parse/compile overhead
Multi-row VALUES - Reduces round-trips and logging
Disable indexes - Eliminates index maintenance during load

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Request] - Improve performance of PC2-TestData.sql #478

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