Skip real-data tests in non-real-data jobs

I am excluding strategies execution with annotation `real_load` in
non-real-load jobs.

This is partial backport of [1].

[1] https://review.opendev.org/c/openstack/watcher/+/945627

Modified cherry-pick as there is not prometheus job in 2024.2.

Change-Id: I77d4c23ebc21693bba8ca0247b8954c6dc8eaba9
(cherry picked from commit ce9f0b4c1e)

.zuul.yaml

@@ -85,6 +85,7 @@
     vars:
       tempest_concurrency: 1
       tempest_test_regex: watcher_tempest_plugin.tests.scenario.test_execute_strategies
+      tempest_exclude_regex: .*\[.*\breal_load\b.*\].*
 
 - job:
     name: watcher-tempest-multinode