Resolve "Snowplow integration - cannot find variable sesName"

What does this MR do?

Currently we're using localStorage as stateStorageStrategy for our snowplow integration. This leads to a Javascript error (see https://gitlab.com/gitlab-org/gitlab-ee/issues/8111) which has already been fixed upstream but not released yet by snowplow.

As a temporary fix, this MR switches the stateStorageStrategy to the default (=cookie).

In the follow-up issue https://gitlab.com/gitlab-org/gitlab-ee/issues/8432, we should revert the change introduced here and switch back to stateStorageStrategy: localStorage

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/8111

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• EE specific content should be in the top level /ee folder
• For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?

Closes #8111 (closed)