ci: Quick exit qpa extraction for non-matching qpas.

When you're bringing up a new driver in CI with significant number of
failures (or when a CI run breaks a driver), the QPA extraction can easily
take the whole job timeout as we go about processing each QPA (100 of them
in my early VK CI fails) per unexpected result we're saving (50), which
involves reading and each line of the file in shell.  By quickly filtering
out the QPA files not including our test, we can save all that shell
overhead, bringing QPA extract time down to a couple of minutes.

Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5225>

.gitlab-ci/deqp-runner.sh

@@ -133,7 +133,13 @@ extract_xml_result() {
     shift 1
     qpas=$*
     start="#beginTestCaseResult $testcase"
-    for qpa in $qpas; do
+
+    # Pick the first QPA mentioning our testcase
+    qpa=`grep -l "$start" $qpas | head -n 1`
+
+    # If we found one, go extract just that testcase's contents from the QPA
+    # to a new QPA, then do testlog-to-xml on that.
+    if [ -n "$qpa" ]; then
         while IFS= read -r line; do
             if [ "$line" = "$start" ]; then
                 dst="$testcase.qpa"
@@ -155,7 +161,7 @@ extract_xml_result() {
                 return 1
             fi
         done < $qpa
-    done
+    fi
 }
 
 extract_xml_results() {