fix: handle errortracking init error

What does this MR do?

From #615 (closed)

We ignore the error when initializing the error tracker in https://gitlab.com/gitlab-org/gitlab-pages/-/blob/master/main.go#L28 so we might be blindly assuming it’s working, when in fact is not.

TODO

• I added the Changelog trailer (e.g. Changelog: feature) to the commits that need to be included in the changelog
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines