[rc2] Enable the JSON data type for Azure SQL Database

[roji]

Closes #36460

Description
Support for the new SQL Server JSON data type was temporarily disabled for rc.1 as support for it wasn't yet fully rolled out to Azure SQL Database. Support has since been rolled out fully, and so this PR enables that support in EF for rc.2.

Customer impact
This allows using the new SQL Server JSON data type when targeting Azure SQL Database (as opposed to on-premise SQL Server 2025). This is a main feature of EF 10, and the reenabling was planned.

How found
User-reported

Regression
No

Testing
Already exists, manually validated against Azure SQL Database:

Validation checks performed on Azure SQL Database

-- OPENJSON over json data type works:
SELECT * FROM OPENJSON(CAST('[{ "a": 8 }, { "a": 9 }]' AS JSON)) WITH ([Foo] INT '$.a');

-- modify works:
CREATE TABLE foo (bar JSON);
INSERT INTO foo (bar) VALUES ('{ "a": 8 }');
UPDATE foo SET bar.modify('$.a', 10);
SELECT * FROM foo;

-- JSON_VALUE with RETURNING:
SELECT JSON_VALUE(CAST('{ "a": 8 }' AS JSON), '$.a' RETURNING int);

Risk
Extremely low, extremely targeted enabling of an already-existing feature for Azure SQL Database only.

/cc @uc-msft @yorek

[artl93]

RC2