[CI] watcher.t.i.ExecutionVarsIntegrationTests & WebhookIntegrationTests

[costin]

08:34:34 Tests with failures:
08:34:34   - org.elasticsearch.xpack.watcher.test.integration.ExecutionVarsIntegrationTests.testVars
08:34:34   - org.elasticsearch.xpack.watcher.actions.webhook.WebhookIntegrationTests.testWebhook

fails in
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+multijob-unix-compatibility/os=ubuntu&&virtual/2400/console
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+multijob-windows-compatibility/1598/console

Reproducible with:

REPRODUCE WITH: ./gradlew :x-pack:plugin:watcher:test -Dtests.seed=80E2F7169B353965 -Dtests.class=org.elasticsearch.xpack.watcher.test.integration.ExecutionVarsIntegrationTests -Dtests.method="testVars" -Dtests.security.manager=true -Dtests.locale=ro-RO -Dtests.timezone=Canada/Saskatchewan

REPRODUCE WITH: ./gradlew :x-pack:plugin:watcher:test -Dtests.seed=80E2F7169B353965 -Dtests.class=org.elasticsearch.xpack.watcher.actions.webhook.WebhookIntegrationTests -Dtests.method="testWebhook" -Dtests.security.manager=true -Dtests.locale=da-DK -Dtests.timezone=Cuba

or

gradlew :x-pack:plugin:watcher:test -Dtests.seed=27F9E9764F12D583 -Dtests.class=org.elasticsearch.xpack.watcher.test.integration.ExecutionVarsIntegrationTests -Dtests.method="testVars" -Dtests.security.manager=true -Dtests.locale=ru-RU -Dtests.timezone=America/Caracas

REPRODUCE WITH: gradlew :x-pack:plugin:watcher:test -Dtests.seed=27F9E9764F12D583 -Dtests.class=org.elasticsearch.xpack.watcher.actions.webhook.WebhookIntegrationTests -Dtests.method="testWebhook" -Dtests.security.manager=true -Dtests.locale=es-HN -Dtests.timezone=Asia/Bangkok

[elasticmachine]

Pinging @elastic/es-core-infra