[QA] update code coverage to use its own script (#100199)

* do  run build script for code coverage

* fix notifyOnError call

* remove maxWorkers argument

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

test/scripts/jenkins_code_coverage.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+cd "$KIBANA_DIR"
+source src/dev/ci_setup/setup_env.sh
+
+if [[ ! "$TASK_QUEUE_PROCESS_ID" ]]; then
+    ./test/scripts/jenkins_build_plugins.sh
+fi
+
+# doesn't persist, also set in kibanaPipeline.groovy
+export KBN_NP_PLUGINS_BUILT=true
+
+echo " -> Ensuring all functional tests are in a ciGroup"
+node scripts/ensure_all_tests_in_ci_group;
+
+echo " -> Ensuring all x-pack functional tests are in a ciGroup"
+node x-pack/scripts/functional_tests --assert-none-excluded \
+--include-tag ciGroup1 \
+--include-tag ciGroup2 \
+--include-tag ciGroup3 \
+--include-tag ciGroup4 \
+--include-tag ciGroup5 \
+--include-tag ciGroup6 \
+--include-tag ciGroup7 \
+--include-tag ciGroup8 \
+--include-tag ciGroup9 \
+--include-tag ciGroup10 \
+--include-tag ciGroup11 \
+--include-tag ciGroup12 \
+--include-tag ciGroup13 \
+--include-tag ciGroupDocker

vars/kibanaCoverage.groovy

@@ -189,17 +189,23 @@ def ingest(jobName, buildNumber, buildUrl, timestamp, previousSha, teamAssignmen
   }
 }
 
+def prepareKibana() {
+  kibanaPipeline.notifyOnError {
+    runbld("./test/scripts/jenkins_code_coverage.sh", "Verify tests")
+  }
+}
+
 def runTests() {
   parallel([
     'kibana-intake-agent': workers.intake('kibana-intake', './test/scripts/jenkins_unit.sh'),
     'kibana-oss-agent'   : workers.functional(
       'kibana-oss-tests',
-      { kibanaPipeline.buildKibana() },
+      { prepareKibana() },
       ossProks()
     ),
     'kibana-xpack-agent' : workers.functional(
       'kibana-xpack-tests',
-      { kibanaPipeline.buildKibana() },
+      { prepareKibana() },
       xpackProks()
     ),
   ])