Fix SQL UNION column count mismatch in include/revinclude queries

[mikaelweave]

When using _include and _revinclude together in FHIR search queries, the SQL generator was producing UNION statements with mismatched column counts. Include queries projected 3 columns (T1, Sid1, IsMatch) while other branches projected 4 columns (T1, Sid1, IsMatch, IsPartial).

The fix ensures IsPartial is always projected in HandleTableKindInclude() regardless of IsIncludesOperation flag.

Added E2E regression test to verify the fix.

Related issues

AB#181200

Testing

Describe how this change was tested.

FHIR Team Checklist

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Semver Change (docs)

Patch|Skip|Feature|Breaking (reason)