zink/ci: merge piglit testing with deqp-runner for RADV

This avoids using an extra script to run GLCTS+piglit.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25062>

.gitlab-ci/valve/gl_combined_testing.sh

@@ -1,23 +0,0 @@
-#!/bin/bash
-
-set -eu
-
-function execute_testsuite {
-    local RESULTS_FOLDER EXEC_DONE_FILE
-
-    RESULTS_FOLDER="results/$1"
-    EXEC_DONE_FILE="$RESULTS_FOLDER/.done"
-
-    if [ ! -f "$EXEC_DONE_FILE" ]; then
-        DEQP_RESULTS_DIR="$RESULTS_FOLDER" PIGLIT_RESULTS_DIR="$RESULTS_FOLDER" $2
-        touch "$EXEC_DONE_FILE"
-    else
-        echo "--> Skipped, as it already was executed"
-    fi
-}
-
-echo -e "\n# GLES/GL CTS testing"
-DEQP_SUITE=zink-radv execute_testsuite gles ./install/deqp-runner.sh
-
-echo -e "\n# Piglit testing"
-execute_testsuite piglit ./install/piglit/piglit-runner.sh