SQL Server to Postgres Migration Fixes

[labkey-martyp]

Rationale

1. age_in_days / age(..., SQL_TSI_DAY) — Preserves SQL Server's calendar-boundary semantics for timestampdiff(SQL_TSI_DAY, ...) on Postgres, where the native operator counts 24-hour intervals instead. Consistent with the existing age_in_months/age_in_years functions; permanent addition to LabKey SQL.
2. CAST(... AS BOOLEAN) in SELECT lists (QuerySelect.java) — On SQL Server, boolean QMethodCalls in a select list are wrapped in CASE WHEN (...) THEN 1 ELSE 0 END to avoid predicates as scalar values. But CAST(x AS BIT) is already a value, not a predicate, and SQL Server rejects the wrapped form. Fix excludes ConvertInfo from the wrap. (repro: insert failing query / error)
3. DatabaseMigrationService.registerSchemaContributor — Interface for DatabaseMigrationService.registerSchemaContributor in premiumModules

Related Pull Requests

• https://github.com/LabKey/premiumModules/pull/499
• https://github.com/LabKey/tnprcEHRModules/pull/277

Changes

• Method.java — age_in_days method, age(..., SQL_TSI_DAY) dispatch, updated validation
• QueryTestCase.jsp — tests for both new syntaxes including datetime calendar-boundary cases
• LabKeySql.md — documents age_in_days
• QuerySelect.java — skip boolean wrap for CAST/CONVERT on SQL Server
• DatabaseMigrationService.java — new registerSchemaContributor interface method