[GH-2799] Fix ST_OffsetCurve Snowflake V2 test failing with ST_AsText type error

[jiayuasu]

Did you read the Contributor Guide?

• Yes, I have read the Contributor Rules and Contributor Development Guide

Is this PR related to a ticket?

• Yes, and the PR name follows the format [GH-XXX] my subject. Related to Add ST_OffsetCurve function #2799 (follow-up to [GH-2799] Add ST_OffsetCurve function #2811).

What changes were proposed in this PR?

TestFunctionsV2.test_ST_OffsetCurve fails when run against a real Snowflake environment:

net.snowflake.client.jdbc.SnowflakeSQLException: SQL compilation error: error line 1 at position 7
Invalid argument types for function 'ST_ASTEXT': (GEOMETRY)

The test calls sedona.ST_AsText(...) on the result of the V2 ST_OffsetCurve, which returns a native GEOMETRY. However, TestBase.registerDependantUDFs() only registers the V1 sedona.ST_AsText(BINARY) overload, and the test never registers the V2 ST_AsText(GEOMETRY) overload, so SQL compilation fails.

This PR switches the assertion to Snowflake's native ST_AsText (and its compact WKT output format), which is the convention used by all other tests in TestFunctionsV2.

How was this patch tested?

• snowflake-tester compiles; the fix follows the exact pattern of the other passing V2 tests (e.g. test_ST_AddPoint, test_ST_Boundary). The suite only runs against a real Snowflake account with credentials, which is not exercised by the GitHub CI here.

Did this PR include necessary documentation updates?

• No, this PR does not affect any public API so no need to change the documentation.