Migrate top-level test 'values' to 'arguments' (dbt0102)

[sushil6666]

Migrate top-level test values to arguments (dbt0102)

Summary:
Wrap top-level values: under the arguments: key for accepted_values tests in the integration tests schema to address dbt deprecation dbt0102 (deprecated top-level test arguments). This keeps test behaviour identical while conforming to the newer schema.

Changes:

• Move values: into arguments: for all accepted_values usages in integration_tests/models/sql/schema.yml.

Why:

• Prevents deprecation warnings and future breakage in dbt-fusion/dbt versions that enforce the new schema.

Testing:

• This is a static YAML-only change; no runtime logic modified. Tests remain the same and will continue to pass in CI.

Notes:

• Created by automated migration from the local repo that detected dbt0102 warnings. See PR for patch details.

[sushil6666]

done