fix(renovate): include truncated versions by default

This includes the renovate-truncated-versions.json file by
default. This way we don't need to set it in all projects where we
want to use truncated versions.

In some cases, for example `jsonnet-tool` we want to use truncated
versions, but we forgot to include this file. This means that the
dependencies no longer get updated. For example:
https://gitlab.com/gitlab-com/gl-infra/jsonnet-tool/-/jobs/9155867928

I think it is safe to use this as the default, because we limit the
number of packages we allow this for in
`renovate-truncated-versions.json`.

renovate-common.json

@@ -2,7 +2,8 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
     "config:base",
-    ":disableDependencyDashboard"
+    ":disableDependencyDashboard",
+    "gitlab>gitlab-com/gl-infra/common-ci-tasks:renovate-truncated-versions"
   ],
   "prHourlyLimit": 0,
   "prConcurrentLimit": 0,