mesa: don't report 1 for GL_VALIDATE_STATUS if user didn't validate pipeline

mesa: don't report 1 for GL_VALIDATE_STATUS if user didn't validate pipeline

dEQP expects GL_VALIDATE_STATUS to be set to 0 if the user didn't call
glValidateProgramPipeline even if the pipeline is valid, but we will
validate pipeline objects in state changes, not draw calls.

This will fix a failure in this test caused by the next commit:
dEQP-GLES31.functional.state_query.program_pipeline.validate_status_get_program_pipelineiv

Reviewed-by: Zoltán Böszörményi <zboszor@gmail.com>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8798>