3.x: Fix `SkipException` being treated as a failure in integration tests

[nikagra]

Annotated integration tests on branch scylla-3.x treat SkipExceptions as a failures. Each such test has two runs, one is skipped and a second one is failed:

Error:  com.datastax.driver.core.VirtualTableMetadataTest.should_parse_virtual_metadata
[INFO]   Run 1: PASS
Error:    Run 2: VirtualTableMetadataTest.should_parse_virtual_metadata » Skip Version >= 4.0.0 required, but found 3.11.2. Justification: Does not meet minimum version requirement.
[INFO] 
Error:  com.datastax.driver.core.exceptions.FunctionExecutionExceptionTest.should_throw_when_function_execution_fails
[INFO]   Run 1: PASS
Error:    Run 2: FunctionExecutionExceptionTest.should_throw_when_function_execution_fails » Skip Skipping test because it is disabled for Scylla cluster.

This may be due to a workaround for testng 6.13.x bug being incomplete