[ftr] determine oss ciGroups by reading the yaml file (#32575)

.ci/jobs.yml

@@ -1,7 +1,6 @@
 JOB:
   - kibana-intake
   - x-pack-intake
-  # make sure all kibana-ciGRoups are listed in tasks/function_test_groups.js
   - kibana-ciGroup1
   - kibana-ciGroup2
   - kibana-ciGroup3

tasks/function_test_groups.js

@@ -17,27 +17,18 @@
  * under the License.
  */
 
+import { readFileSync } from 'fs';
+import { resolve } from 'path';
+
 import execa from 'execa';
 import grunt from 'grunt';
+import { safeLoad } from 'js-yaml';
 
-/**
- * The list of tags that we use in the functional tests, if we add a new group we need to add it to this list
- * and to the list of jobs in .ci/jobs.yml
- */
-const TEST_TAGS = [
-  'ciGroup1',
-  'ciGroup2',
-  'ciGroup3',
-  'ciGroup4',
-  'ciGroup5',
-  'ciGroup6',
-  'ciGroup7',
-  'ciGroup8',
-  'ciGroup9',
-  'ciGroup10',
-  'ciGroup11',
-  'ciGroup12'
-];
+const JOBS_YAML = readFileSync(resolve(__dirname, '../.ci/jobs.yml'), 'utf8');
+const TEST_TAGS = safeLoad(JOBS_YAML)
+  .JOB
+  .filter(id => id.startsWith('kibana-ciGroup'))
+  .map(id => id.replace(/^kibana-/, ''));
 
 export function getFunctionalTestGroupRunConfigs({ esFrom, kibanaInstallDir } = {}) {
   return {