Apply PK and update-operation policy predicates to DWSQL upsert UPDATE statement

[souvikghosh04]

Summary

Aligns the DWSQL query builder's upsert (PUT) UPDATE branch with the MsSql and PostgreSQL builders by including the primary-key predicate and the update-operation database policy in the generated WHERE clause.

Change

• DwSqlQueryBuilder.Build(SqlUpsertQueryStructure) now joins the PK predicate with GetDbPolicyForOperation(Update) and appends it as the UPDATE ... WHERE clause, matching the existing MsSqlQueryBuilder behavior.

Follow-up

• DWSQL REST upsert does not yet return the affected-record result set and has no dedicated PUT test class; response wiring and integration test coverage will be added in a separate change.

[Copilot]

Pull request overview

This PR aligns DWSQL upsert (PUT) query generation with the MsSql/PostgreSQL builders by ensuring the UPDATE branch is constrained by both the primary-key predicate and the update-operation database policy predicate in the generated WHERE clause, preventing table-wide updates and enforcing row-level authorization.

Changes:

• Update DwSqlQueryBuilder.Build(SqlUpsertQueryStructure) to append WHERE <PK predicates AND update-policy predicate> to the upsert UPDATE statement.
• Add a DWSQL upsert unit test to validate the UPDATE branch includes PK predicates and the update-policy predicate.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/Core/Resolvers/DWSqlQueryBuilder.cs	Adds PK + update-policy predicate joining and applies it to the upsert UPDATE statement WHERE clause.
src/Service.Tests/UnitTests/DwSqlQueryBuilderUnitTests.cs	Adds unit test coverage for DWSQL upsert UPDATE branch predicate enforcement (PK + update policy).